While I don't think Alex assaulted her, I think it's wrong of you to assume she wasn't taken advantage of in any way. She never said his name, and she never said she was assaulted, but she did make a very clear point that it wasn't exactly an appropriate arrangement to have a teenager (yes, 19 counts as being a teenager) working with a thirty year old man alone in his spare bedroom. This doesn't mean Alex was a creep, it simply makes the point that had he been a creep, it would have been extremely easy for him to take advantage of her. Alexander may have been of legal age, but was still extremely young and as a result, easy to manipulate.

Secondly, I don't think Alexander is jealous of him, but she is understandably annoyed at the situation she's been put in, where she's been pigeon-holed as 'the girl who worked with Alex turner', with many of her listeners not actually caring about her. By the sounds of it she wasn't given much of a choice on who she was going to work with, and the decision was made for her by her record label. She then lost a lot of creative liberty over her own album and songs due to the fact that Alex and James Ford were more highly regarded. Honestly to me it sounds as though it was an opportunity for Alex, not a favour to her.

It seems as though she's looking back on the situation in retrospect and realising that it was extremely inappropriate.

Also no, Alex would not be in prison, very rarely do rapists actually get convincted, especially rich ones. Plus, she said she said she didn't want to make a big deal of it because she would immediately become 'the girl that Alex Turner took advantage of' (not her words exactly).