Should I mention to the teacher?

My 4 year old girl goes to preschool two half days per week. She has a great time and we haven’t had any negative experience so far. Last week she mentioned that one of the girls told another girl in the class that she can’t see my daughters underwear because that’s private! I asked her some questions and it seems no one was asking to see anything the little girl just made the statement randomly. Today she was changing clothes and said “oh I have to keep my underwear on to cover my vagina because it’s nasty!” I was like who said that? And she said I don’t know so I asked her more about it and she said a boy in her class said that and he learned that at his grandma’s house. I talked to her about it a little and moved on, we have always had talks about privacy and private parts and how no one should be touching there and proper names and all and she says no one has ever tried to see or touch her private parts. I’m not sure what exactly went on in these conversations and it sounds like they’re just conversations their parents are having with them that they’re bringing to school but I’m not loving that she’s come home with these conversations she had a few times. I know this will happen with kids but I’m just wondering if I should mention it to the teacher or just let it pass and continue our conversations at home?