I think I would tip. It is only 5 bucks extra, I would much rather do it than not. I always feel awkward at tip time, only because I want to do it just right, not over (for me) and not under (for them). So, I think I would eat the 5 bucks and give it to her. I don't think you will go wrong, and with 55 bucks already going out, 5 bucks isn't much to add. I don't know about the owner of the business thing. If you've spent this much time wondering about it, I would probably go ahead and do it, you won't regret it. For some reason, this kind of thing really bothers me (as far as me wondering if I've done the right thing). I don't want to be lavish, but I want to be appropriate. I think the egg thing is okay if you know her, but money makes the world go round and pays bills for the business. If close friend okay, but otherwise go with cash.