It depends on how she is doing career-wise and to be honest whether I like her or not. If I don't like her I might use it as an excuse to pull her card (suspend) her. I won't lie, I definitely have double standards depending on how I feel about a girl.
It's tricky because I push every girl on my board to be VERY body conscious. Partly because I am annoyed AF if she has been away for a few weeks and telling me she didn't gain an ounce and she gets into the office and the scale and tape show a different story. You want to piss me off? Do that.
I tell every one of them it's like being a top athlete or ballerina (this is why I love working with models who have done ballet esp Russian ballet), if they want to be at the top then act like it, work work work, discipline, discipline. And that means knowing every inch, every ounce, etc. and also knowing that 90% of the time you can probably do better. Avant, her original mother agency, is definitely like this.
Agree with
@ZeroDiet that it's highly exaggerated and she isn't as thin as she wants people to think.
So assuming I liked her, Lesya and I would have a little talk. I would say your body looks great and you have every right to be proud of it because I know it was hard work to get there and it's hard work to keep it there. And I know we are always pushing you to do better and keep on top of it 24/7. But if you keep doing these extreme pictures and extreme angles just for attention, people (especially people outside the industry i.e. the media) might draw conclusions right or wrong about your mental or physical state and that could end up being a distraction for you and (more importantly) for the agency. If it goes too crazy it could have impacts on the work you get, and if it goes really crazy it could look bad on the agency.
So yes, you pretty little idiot, be proud of your body. Show it off but be more subtle and classy about it. Fine be an attention whore, but do it low key, like don't make it obvious that you're being an attention whore or you will look pathetic. Also stop with the whole "OMGGGGG suffering" BS. One, it's not good for your brand. Two, reality check - you're a model with a smartphone on snapchat living the high life in London, you're not Kafka for fuck's sake.
And there'd probably be more depending on how she took it, and my mood.