Well you beat me to it. I was getting ready to post the same question. I have a female that really flattens herself out and it has/had me worried. At times she is like 3 times wider than high and her spine sticks right out. When I pick her up she rounds out after a few seconds of holding her.
She is still locking up with the male I paired her with so she can't be too close to eggs . . . (?)

I know I didn't answer your question but at least you are not alone!!!

Jim