You will probably get alot of diff answers on this, here are mine
1. Gravid females go off feed, while this is true, it is not written in stone, some gravid females never miss a meal.

2. While laying inverted is one of the signs of being gravid, it is not in itself conclusive.

3. Is she showing a ridge along here spine (tenting)?

She is looking quite plump on the back half, do you have her husbandry records from the previous owner?