QUOTE (IlliniKrush @ Dec 11, 2012 -> 10:36 AM)
This was going to be my suggestion, just talk to each other and come up with a limit or ballpark. It could be weird but you'd rather do that then have someone show up with a $25 gift and someone show up with a $150 gift because it wasn't discussed beforehand.
You can't go over by much if at all, or it's just terribly awkward for her, and she could actually get upset. You're not being a nicer guy by doing so.
I'll probably talk to her about it ahead of time and gauge response. She said like, $50, but I ended up spending about $100.