I wouldn't worry too much about the mixed messages (I understand her father doesn't live with you?). I firmly believe children can deal with different expectations in different environments, even somewhat unrealistic ones, as long as you as the (presumably) primary caretaker keep the pressure low.
DS was getting pressure from both grandmothers, who started putting him on the potty much earlier than I would have (as I am a WOHM, they help out a lot with childcare), and the DCP who felt he was behind because he wasn't interested in the potty at just over two and recommended sticker charts and "not getting into a power struggle" by which they meant not to give in
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I wasn't worried, told the grandmothers and the DCP to take it easy and that he'd be there in his own good time and that I couldn't for the life of me understand what was gained by trying to get rid of diapers and forcing a child on the potty who wasn't ready to say I've got to go, for either bathroom need (even though he could say everything else, in perfect grammar). I don't understand it to this day. (Particularly if it's just about the poop - that's just one pullup a day, what's the big deal?) I hope the DCP heeded my request, I'm pretty sure the grandmothers didn't - however, that is a generational thing and I have found out there are limits to how much pressure you can put on that relationship without it backfiring, and, being generally on the same page, I only put my foot down when it's a real health-and-safety concern (but can someone tell me why that generation feels the need to push juice at children all.the.time?) He was ready at 2y10m after saying he needed to go for about a week or so, then asked to be rid of diapers. That was it. No stickers, bribes, whatever. (I am not bashing bribes, if you need them you need them and it's usually only for a short time).
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She's just so advanced in everything...BUT this, so I suppose the balance has to be somewhere
At some point both you and her father may have to read up a bit more on asynchronous development. It's not about balance - it's about being ready to accept that she may show age-appropriate behaviour in all respects that have to do with physical and socio-emotional development, all of which may be masked by advanced verbal ability. She isn't actually behind, but both your expectations are ahead.