You have already been in the friend zone for too long.
Seven months is more than enough time for her to have figured out whether she likes you as a friend or something more.
Her actions have clearly shown that she only considers you as a friend.
You should move on. There is no chance of romance here.
The more you try to do things like posting pictures of her on social media so as to drop hints, the more desperate and eager you will appear to her and this will only make her that much more unwilling to make you more than a friend.
As a general rule, if you already know that you are interested in a girl, it is best to approach her with that intention from the start and act accordingly, as opposed to getting into a friendship with her in the hopes that she comes around to liking you romantically at some point.