I think it is an effect of her mothers death, specially if she went through depression, she might be emotionally messed up and needs a little attention. Just like some people go to bars get drunk and have sex and somehow pain goes away, its still as bad as a p*rn video. Anyways, its ur right to be shocked, and i would probably feel the same, but i would consider what she went through in the past, and i would confront her about it not to do it again.