how my girlfriends relates with my friends

My girlfriend came to spend time with me and a close friend happens to be around he took out his phone and started singing along to songs he was playing then my girlfriend just rushes to go sit by him and they start singing and recording love songs together now my problem is that I spoke to her to know how to handle her self around ma friends not to make her self too available BA she get carried away and repeats it over and over again so do I continue confronting her about it. I feel like am forcing her to be something she's not, like am trying to change her and I dnt wnt her feeling I dnt appreciate her cuz I do jst wnt her to knw wats appropriate and wats not