Has she been spayed? That usually changes a cats personality a lot.

The only changes I've observed in my cat happened very slowly and over time. And in his case he went from being a dumped unfriendly stray to a very spoiled house cat, but it took months and months for him to decide he could trust me and my bunnies. And, two years, later, he is still a little jumpy when I carry something large or am wearing a long flapping robe or coat....then he panics and disappears for a while. Poor guy!!!