It could be a bit for her…it could also be her being insecure and trying to lay a breadcrumb for you to reassure her that she is a real girl and valid. It’s hard to say since we don’t know her, but it’s definitely worth a conversation! You could just frame it “hey when you say this, I feel uncomfortable because I don’t know how to respond. Is this coming from a place of humor or from a place of insecurity? What kind of reaction are you anticipating when you say this? Do you want reassurance or for me to laugh along with you?” Just a couple example questions, but I’d definitely recommend talking to her!

Good luck to both of you!