If she wants to act like a baby, treat her like one. I would give her a set amount of toys just for her, let her put them in her mouth if she wants. Then when she wants to something that 3 year old would do, I would say sorry you made the choice to act like a baby so you only get those toys to play with. I have the 6 sided play area that I can set up and put them in to play with the toys they want to mouth. At the end of the day you can clean all of the toys she mouthed. It shouldn't take long for her to realize it's no fun being by yourself with a bunch of baby toys.

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