If the appearance of being "stuck" is on the glass (rather than on the LR) then this is the same observation I have made on acrylic (with multiple species) and she will adjust in a week or two. There are no smooth surfaces in the ocean and I think it is learning to adjust to a surface that is overly receptive to the suction that causes the awkwardness.
I have never fed my octos fish but often keep shore shrimp loose in the tanks that will eventually disappear. I am glad she ate the shrimp and expected as much since both of mine were very fast to accept stick feeding (Beldar, the macropus, is the only one that was very slow to eat them and still refuses the shrimp a couple of times a week). I think octos need to eat slowly and it has been common for them to take food back to their dens until they were comfortable in their tank so you may want to return to the tank in an hour and see if she will come out. Most of mine go almost catatonic for maybe half an hour after accepting food (sometimes Beldar sits for a full hour) but all of them have eventually stayed where they accepted the food once they felt secure that nothing else would try to take it away. The visiable fish may slow or negate eating in the open. The hummelincki we saw in the wild was being pestered by a wrasse (and was the reason that we saw it at all) and we suspected the fish was trying to collect scraps from its meal so I think protecting its food is a natural behavior in the wild). On the other hand, Animal Mother observerved more activity with his mercatoris when it could see other fish and felt Einy was "happier" in this kind of environment so the viewable "others" may add to the environment once Ziva understands they cannot "visit" her.
The red LED is likely to be fine, as it was only when the light was in white light mode that we saw problems. She should be sleeping through the night and will want a dark place. Some have been reported to sleep on the glass (Carol's
Oscar comes to mind) but mine always chose their dens (I don't think Oscar ever picked a den). On a typical day, mine would "wake up" around three in the afternoon and stay up until lights out (around 11:00 PM) so you might try adjusting your lighting to your own enjoyment times, allowing about 8 hours when you are most likely to be home. We noted that Octane would often "go to bed" about two seconds before lights out so he was definitely aware of some sense of timing.
Since you mentioned my interaction experiements, here are a couple of suggestions to begin. When she starts staying out to observe you make petting motions on the glass (here again, regular, repetitive timing helps). Once she accepts the action without fleeing (and she may come to you), you can start working with her in the tank. Pick a "petting corner" and do not use any other place for the experiements and do not chase her in any way. Put your hand in the tank and slowly make the same gestures with your fingers. She should come to investigate and eventually (not long with hummelincki) touch. Allow her to touch but when she sucks down on your finger or hand and tries to pull, resist. If she does not free your hand (she likely will the first few times and may touch and run initially), lightly touch the back of her arm with a free finger or with your free hand. For whatever reason, touching the top of the arm should cause her to immediately release you (as she is learning, later she will allow even this kind of touch). Oddly enough, all my octos are less sensitive about a touch on the mantle than on the back of an arm.
As you start with your hand inside the tank, observe what she does when she runs away and come up with something more or less natural but
distinct that can be a signal for hands-out-of tank. This is very important. The action needs to be distinct and you must me consistent. With Beldar, we use all arms off the glass. SueNami has to swim through the tube to the other side (SueNami understands hand out of tank but still does not allow petting). You will be amazed on how quickly they understand this and will test you over and over so close adherence is a must. They will also learn the play corner and the fun part starts when they test you. The day Beldar "
got it" she played "make the lady sit" for two full hours and you could not help but feel she was having fun making me get up and down (I have to use a small ladder to put my hand in her tank). The link for Beldar provides a first hand description of that experience and a repetition of my method. Once Ziva does not grab and accepts touch, she MAY stop interacting this way for a week or so. Just keep offering by wiggling your fingers in the play corner and she will eventually come and then be consistent there after. My experience with this "forgetting" has been common with all that I have successfully trained and I think there is something a bit unusual about octo memory. When she resumes playing, you will not start over, she will fully remember the rules and likely play daily with an occassional day she will not want to play. Additionally, she should repond anytime she is out, not just at the routine time you use to initiate the interaction.
Good luck and please journal what you attempt, my method or any other, and the results.