85g and had eaten 5 times over a period of 5 weeks? Maybe can't say that it's impossible.She was an awfully tiny hatchling then. I've had some little ones out of the egg at 81-88g this year. She doesn't look emaciated which is good. But she does sound stressed. The refusals and the cruising the tub all the time tell you that. Here's what I would do.
Black out the tub. Either spray paint the outside, or cover it with heavy construction paper.
Leave her for a couple days after that.
Try feeding with a live mouse hopper.
I wouldnt say it's time to assist yet.
Well good luck with her.
Check out what's new on my website... www.Homegrownscales.com