Yeah, this is how one of many developmental periods that will disrupt sleep. I let DS have a dummy, he needed it and could replug himself around 5 months so it wasnt an issue for us with him waking for it every sleep cycle. I think given its helping her resettle but she can transition from one sleep cycle to the next without it that IIWM I'd keepp it but if you want to wean it you can, might as well do it while you're already doing some sleep training.