I don't think she looks bad at all. A little rib is good to see..some people actually prefer it. I also see what you are saying about her hip bones..my horse is like that too and I asked people around me if she was too thin still but I got the response that she is in shape and looks good..I worry just like you. You are a owner who (can't think of the correct word) notices everything about your horse and that is very good.
She is young and at her age they go through some awkward stages but she will fill out again..just probably growing :)...kinda like teenagers ..they go through weird stages...boy,I sure did!
She is very gorgeous.