Is she still in diapers? If so, she sees no reason to switch to the inconvenient toilet when diapers are so easy. She doesn't need to stop playing to go, so why would she. I would take the diapers away and tell her you ran out and it's time to go in the potty you WILL have accidents, but when she realizes diapers are definitely not coming back she will do it. If you need to use for night time then tell her they are special night time only ones and only put on right before bed.
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