Dont worry about that afc **** man, You were nervous on a first date along with 100% of men that go on first dates with girls they are interested in. I would bet the farm she was just as nervous.
Theres is nothing wrong with buying a girl a little gift. If you got to know her real good on the first date, then really there is nothing wrong/afc with that at all. It just depends on the girl really and it shows you thought about her(which is really what she has been thinking since the first date). I mean dont go ****ing nuts and get flowers sent to her house, and show up wearing a tuxedo on the 2nd date.
Honestly, from personal expierence from my high school and college years, worry about performing was the ONLY thing that would just give me strait up ED when it came down to it and really I've just been honest with them, and it's never ****ed up sexual relationship I've ever had, even if I was Bob Dole without the bottle the whole night.
Sounds like you like her and for her to txt you and tell you she had a great time, she sounds like you just as much if not more. Just try to have fun with her man. The physical part will open itself up when the time is right(and it wont be long at all). So, just roll with it and good luck.