delete content

Hi guys, I have an unusual problem. Yesterday I installed Bleachbit on my sister's computer (Windows Vista OS). She was keeping her photos in the "Photos Library". When she opened the folder Bleachbit started to delete the content. She managed to stop the process, but she lost some photos. Do you have any idea what went wrong? Please, tell me what to do! By the way, I use Bleachbit for 3 years and I got nothing like this kind of problem.