Hello,
That's great she is eating pretty well now. Since you haven't had her long, the kink in the tail is likely nutritional or UVB related from before you got her.
Not at all, the 10 gallon is just too small & when she is done eating, she is just ready to get out & explore or go back to bask & digest. You don't need to heat the smaller feeding tank for her.
Tracie