Yeah I wouldn't do a rose at this point either. But you did say that she knows that you like her. You can get her a gift, just make it light hearted and fun. Get her a teddy bear or something and just say that you were out and about and was thinking about her.

Confidence goes a long way, every contact you have with women you like does not have to be all serious. Some people say "don't get a gift" but if your confident about it then go for it. just make it fun and not an "I love you thing" In fact it should usually be light hearted and fun, not all "you’re my girl and I’m your man" If you want to get her a gift then fine, go for it, just be cool about it and don't try to make it mean a whole lot.