Does she still have reflux?

I gave DD a dummy at 6 weeks ish cos she had colic/reflux and it really helped at that time. When the colic stopped, she just spat out the dummy and didn't want it anymore.

I gave DS a dummy probably a little earlier cos he had reflux and worse than dd. Similarly, when the reflux cleared he just gave up the dummy.

Maybe wait until the reflux has cleared, hopefully soon as your little one is sitting up more, and then it may not be as difficult to get rid of it.