Toddler mommies, help😭

Hi girlies! So I’ve ran into a little problem with my 4 year old daughter. It seems shes.. discovered herself.. and I don’t know what to do or where to begin correcting. Is anybody else’s child just humping things?! I don’t know what to do and I’m at a loss😖 I’ve posted about this before and I literally only got replies of “well someone touched her!” And that’s not the case because she’s in my care literally 24/7 and never left alone. But I’ve read it’s normal behavior but I’m so conflicted if it is or isn’t. Y’all I was around 5-6 when my mom made me parade my neighborhood with a sign saying “I masturbated and I’m only 5-6* “. So like I really really don’t know what to do and if its a good or bad thing. The childhood trauma I endured because I had discovered myself, has kinda put a damper on this topic because I don’t know what to do. Please help me.. please I just wanna cry 😖🥺😭 for once in parenting, I’m at a loss. So far the only thing I’ve done, is take away the damn unicorn thing that she uses. Please no negative comments about this! If you can’t give advice or support or relate to this topic, please don’t comment. 😔