I think she is way too skinny. It's no shaming but you can tell, that it's not her natural shape and also because of her energy and appearance that she seems "emaciated". It's not trained oder toned anymore. And also because of the way she achieved that.
The dress doesn't really suit her. It's not her style. But I think she doesn't have any style at all. She just wears trendy stuff and looks and dresses like a Zara mannequin. That's why she bought the dress. That kind of style was trendy and on Instagram aaaaa lot over the last few years.