Hi Robert,
I've read over this thread - your little octo does seem rather large for a pygmy octo. Now that it's hiding, it will be hard to take pics. Joubini only grows to a mantle size of less than 2 inches, and is reddish orange with pale bands across the web and arms, if that helps.
It's the time of year for egg laying. She might have a den with eggs - be sure to offer food where she can reach it without leaving her den. Most of them do seem to continue eating when provided with food like that. If she doesn't accept frozen food, try live - someone else had an octo with eggs that wouldn't accept frozen food anymore.
She is an attractive little octopus and I hope you enjoy her whatever.
As for the temperature, without knowing the species, it's hard. Probably just leave it at room temperature. O. joubini lives in the Gulf of Mexico - I've been told it's in the bay between Galveston and the Mainland, and I don't think the temperatue there is always so warm.
I'm going to start a new list of our octos for the non-bimac octo pets, so I'll add Octavia.
Nancy