My friend deleted all the photos of me and her?

It is difficult to know what her agenda is without knowing what kind of person she is. To put your mind at ease, it would be a good idea to have a chat with her and ask her if there is any particular reason she deleted the photos. Don't be in too much of a stampede to do so, just treat it casually, because she may not have meant anything by it. People do strange things, sometimes just on a whim, sometimes to get a reaction or be in control of a relationship or friendship. Your best bet is to not let her see it has ruffled your feathers. Because either way, if you seem too worried by it, it might not be in your interests for this friendship. However, if she is unpleasant to you for no reason, then just walk away, and don't look back.