Oh dummy weaning, it's a tough one isn't it? Have you tried distracting her with something else when she throws a tanty about it? Maybe say something like, "how about we draw a picture" or "let's go and look at the birds outside" (sorry, pretty bad examples lol) or even distract her with a snack?

I found dummy weaning soooo hard. It ended up happening when my DS was 2.5yo after he had a fall and damaged his mouth and teeth. He didn't want to put anything in his mouth so I used the opportunity to hide all his dummies! When his mouth healed he asked where they were, but got over it when we said he is too old for them now. I'm sure there is a better way than that!!

Good luck