Idk. While she's definitely too frightened for the scene, I do think that just because she's had her tail removed before doesn't mean she's just going to lie back and accept it. You don't remember pain though you definitely recall that you don't want it to happened again. If you've had your arm broken(or even something smaller like your fingers) a couple times in your past, despite it being fixed up every time, you're still going to fight before letting it happen again.
Although I'm wondering if her tail regrowth has a solid reason like 'her Cheetah form is removed of damage when she switches back to human form' or if it's just one of those comic things that never sticks.