Toddler help

I have a 4 yr old daughter she’s very sweet she is a super good girl. Earlier today I was cleaning and I just so happened to go upstairs and I saw her playing with her teddy bear and a doll... they were kissing. I’m not sure, if it’s normal. Isn’t she too young, I don’t remember doing these things until I was like 8 or 10 maybe even older than that. I’m scared she’s learning things she shouldn’t. How do I go about this?