1 & 4 need some work IMO. #2 is definitely the best.
Honestly, and I feel like a pretty big douche by saying this, but modeling standards being what they are, she seems like she'd need some touch up / airbrushing work to get up to bar. I feel bad saying that because she's a really cute girl, but modeling is harsh & extremely critical. I can't say I see her being at that level really.
#4 just isn't a flattering angle for her. #3 seems like its lost between being a close-up shot and being a shot that requires background balance. The only other definitive thing I would say, is that #1 was edited too much with a gaussian blur. If she was supposed to be such the focus in that picture, then the rest of the frame shouldn't be there anyways. If you're going to have that frame, then don't blur it out so much IMO.
Really for her to be a model she has to be comfortable in front of a camera. The only one that gives that vibe off (to me) is #2. The others seem to come across as either really staged or pretty uncomfortable for her.