If this were your daughter, how would you navigate?

Hello 💓. My daughter is 11 years old and today her crush asked her via school email, to be his girlfriend. My daughter and I have a very close relationship and she tells me everything. I don’t feel comfortable with her “dating” in 5th grade but I also don’t know if explaining to her that boyfriend and girlfriend relationships are for older teenagers will deter her from telling me things in the future and will encourage her to hide things if something like this comes up again. I’m a single mom and looking to get advice from other parents who have navigated these waters before.