My first girl was like that too! So sweet and calm, and fun to watch. She just laid 8 slugs, I didn't expect them and was worried about her, now I have to get her fed and back up to weight.
I have done several rescues since then, the only other girl I have (beautiful white Snow) is a total witch! You just come near the viv and she coils and rattles her tail, comes at me with a vengeance when I take her waterbowl to change and strikes every time. She is 13, so maybe she is just a cranky old lady, but I don't know how well she was treated before someone wanted to get rid of her.