Not an easy question to answer, especially since she is brooding. I have posted videos with the comment that an animal is becoming curious and appears to see human attention followed by comments of ooos and ahhhs and then someone will see the video quite differently and suggest that the animal is barely tolerating my presence.

. Alternately, I have disagreed with the meaning of a behavior that many insist is an unstressed cleaning routine but I feel strongly that it is a sign of stress.
That being said, if she is no showing strong coloration when she holds your finger, I suspect it is not a sign she is upset. If you want her to release you before she seems ready, sometimes gently stroking the top of the engaged arm will encourage release.
I have had a couple of brooding/senescing animals that did seem to want their skin stroked, possible because it was wasting and itched. One of my saddest memories was with an animal that would frequently approach my hand but would always withdraw her arm just before making contact. It was like she REALLY wanted to investigate but was afraid to do so but never did until minutes before she died (of old age) when she reached up and touched my arm and expired.