All you can really do is let her know your interest.
In the end she has to begin to trust in the situation and in you. She has to be the one to take the plunge.
You can't do much more than what you already have. That said though a friendly sweet trinket isn't out of the ordinary in my group of friends. So you can express a bit (fullfilling your need) and not make it overhwhelming (fullfilling her need)..