Charlotte's Pride (The Sacred Order Book 1)

Charlotte works in a lab and discovers they're abusing animals. She takes it upon herself to rescue them and ends up with three big cat shifters, a cheetah that wants to be her mate, a lion that wants to mate her, and a tiger that just plain hates her. But the lab they came from isn't so willing to just give up and she'll have to fight if she wants to save them all.