My cousins daughter keep trying to kiss people?

My cousins daughter is 6 or almost 7 and she keeps trying to kiss people. She isn't trying to kiss anybody though but certain people. One incident was we were at my cousins place(I'll call her anna)and my other cousin(I'll call her Jane)was there with her two daughters. Jane caught the 6 year old telling her daughter to kiss her and to keep kissing her. When Jane told Anna what her daughter did all she said was "don't be saying that". Jane went and stepped up and told her that it wasn't right for a little girl to try and kiss others like that and that it's for adults only. Later on after that another incident happened where she told my 16 year old brother to kiss her and once again Anna only said not to be saying that. The last incident something happened the 6 year old told my husband to kiss her. Her mom never gives her any kind of talk about how wrong that is. Shouldn't she or her husband step up to teach her daughter that's not ok? I stopped going to her house because her daughter is just way too much and keeps acting like she's and adult while her mom just tells her to be quiet instead of trying to teach her how a little girl should behave.