I wouldn’t be in a big rush to get her to give it up, Claire. She is young, and it sounds as though she sucks her thumb mainly when she goes to bed. If she sucks only when holding her “dolly,” you have an ace in the hole. Put the “dolly” away when she gets up and tell her she can have it again at naptime and bedtime. She will protest, so say very matter-of-factly, “Well, if you need your dolly now I’ll put you back in bed for a while.” This will probably help but won’t be a magic bullet if she is really hooked.
In your weaning process, you have three allies you should bring into the action—her three older brothers who managed to quit sucking their thumbs. Don’t let them tease her too hard, but encourage them to drop a remark every now and then to the effect that, if she wants to appear to be a big girl and to do the things they do, she will need to stop sucking her thumb.
Our parenting advice is given as suggestions only. We recommend you also consult your healthcare provider, and urge you to contact them immediately if your question is urgent or about a medical condition.