I think she did it herself

of course.

she was on the phone saying something like "im done now?"

Yeah Julie said that it was Klaus's compulsion that made her do it.

I think Kat and Isobel are/were the ones with the most survival instinct, I don't think she would just kill herself.

i think she was compelled, but even if not, they suggested it to her.

But, didn't the guy on the phone with her say "you're done FOR NOW", or something like that? It sounds like he expected her to stick around. Maybe I'm remembering it wrong.

she said it. "im done?" "yes your done." then she killed herself. that is just what that guy did who was compelled by her.

At first I thought she did it on her own but then when someone suggested to me that she might have been compelled to do it I wasn't sure.

I think she was compelled... :/

I Think.

I don't think she was for the simple fact that they told her she was done. I just think that the guilt of betraying the 3 people she actually cared about was too much for her to handle.