I think you did fine. I think it's great that she felt safe talking to you. My opinion is that kids don't just magically know what to do just because they had a birthday and are of "the age" to date. We do a disservice to our children with that type of mentality! I feel that by letting her try a little, but being involved and there to talk to, you are able to guide her through some basic decision making and confidence building steps so that she's more prepared later on when it's "real" dating. Of course, if kids are just left alone to "date" at 7th grade, not much good could come of it. But learning some real basics with an involved parent is a good thing.
When I was in 7th grade, I was "going with" a boy that I am still friends with, 24 years later! My dad used to say "where ya going?" when I'd mention (or he'd overhear) that I was going with ___. It'd just make me roll my eyes and say "DAD!" He would get a kick out of that. But mom---it's interesting, looking back now with adult eyes, to know that she was guiding and teaching me, even though I didn't really realize it. She'd say "What I really like about __ is how he asked my permission to take a walk with you first-that showed respect and courage." (the very first time we did something out of school or the public pool). She knew where we were at all times (not allowed at his house, but we could go to my house---bedroom door ALWAYS open, or to the public pool (she knew the lifeguards there on a first name basis), and a couple times we went to the mall and ate at Casa Ole, or went to the movies with 5 other kids (including my little brother), we all went in 2 cars, dropped off by 2 moms. But she knew what was going on, talked to his mom, it was a little independence but in a dose my 12 year old self could handle. We did have hormones and some desire to get away, but seriously, there wasn't opportunities for that, lol. We just hugged and kissed but not open mouth. We moved away a year later, and were pen pals. Now we talk on FB once in a blue moon, and phone a couple times. My husband actually likes him; they talk more than we do. It was just a childhood thing but no "real" anything ever developed.
There was another boy before him, who DID kiss me with his tongue. (Mom let me go over there but his mom was different....I almost felt pushed and pressured from her to be with her son, which was very very strange). I actually "broke up" with him because his mom kind of scared me and didn't act like mine. I talked to my mom about it and she helped me with how to do it in a cool way that didn't hurt feelings, and also encouraged me that I was making the right choice and doing well following my instinct about that mom. But the tongue kiss WAS gross (ha!). So I didn't do that with the guy I just mentioned. Because I didn't want to ruin it all with grossness. :P I think that did give me the power later to say no when I wanted to say no, and to not give in to weird pressure.