ok, so to wrap this up....

I am going to lower the temps, because I have had success doing so. I plan to take the hot spot from 90 down to 85 at nights from November the 1st through to December the 1st.

The Bumblebee juvi is in good health, so I'm going to risk her going on a hunger strike and see what happens.

If anyone is interested to know what happens with her, let me know, and I'll post an update to this in December to advise.