[Remove] My (18M) girlfriend (19F) was saying how she can't wait for my daughter to use tampons

Hello, I know this is a weird post, I have 2 daughters, (16) and (13) my gf, who is 19, is always teasing my girls. She's joking, but I don't really like it. Anyway, I've never told her my girls age, just that I have 2 teen daughters. She said, "I can't wait for them to start using tampons", I asked her what she meant, and she said, "I just can't wait for them to meet their first period", and I told her they've both had theirs, and she was so shocked, she asked how old they were, I told her and she said, "Oh, so at least I get to see a 13yr old get her first tampon"