Advice here

Okay so my daughter is almost 3 and she has always “humped” off and on since she was little. She’s recently started up again and it’s like everyday. She will hump “hump” me while we are just laying in bed and I always tell her no you don’t do that to mama and stuff like that but recently she will throw a complete fit and just keep going back to doing it, I’ve even moved her from sitting next to me. She will hump things on the bed too but always goes back to me. Idk why she does it to me. I’m lost on what else to do. I know it’s normal and a lot of kids go through a phase but I can’t take it anymore. PLEA