Is she unwell otherwise? If she is getting sick, she might be seeking the comfort/distraction. My dd has just come down with the flu but she was speaking in one word sentences and melting down constantly earlier in the week, so I can see she obviously wasn't well.

I was a compulsive masturbator as a child. I used to constantly get into trouble. Even at preschool (hahaha especially when I showed another girl how to do it!)

She will grow out of it. I would ignore it and when she does it, just take her hand away gently and distract. If she is persistent tell her it's for the bedroom thanks and if she's still persistent move her there physically.

I would wait a week and see if it's not illness related. A trip to the gp might help rule out thrush or an infection too.

Good luck!
This.

Oh hun, it sounds very hard. Personally I would persist with what you're doing for a week or so more, these things take time. Then perhaps a visit with your gp to discuss where else you go with it. This won't happen forever, I promise. She's still very little and doesn't understand what she's doing, which is why you have to persist with what youve been doing.Good luck. You're doing a fantastic job xxx