Oh good, I'm glad I was just over-thinking it, honestly. The biggest problem in my mind was, I was looking ahead, and I thought, if I continue to let her go to this friends' house (and otherwise hang out with him) for years and years, then at what point would I say, "nope, you can no longer go to his house/a movie/the park/etc because now it's considered a date!"
But I guess I won't worry about it, if it's totally normal for kids to hang out at this age. :)