W.B.
In my opinion there is no out smarting a child like this. So my advice either deal with the accidents when they happen or move back to atleast pull ups and let her get adjusted.
My oldest of 2 girls was 1 1/2 when her sister was born and like your daughter she was doing the samething she would pee in the potty all the time but I kept her in pull ups until after her sister was born and until her babu sister was 4 months old and the house was really adjusted to having a new sister in the house. I didn't want to go through the exact thing you are going thru now.
So I would take a step back out her back in pull ups and go from there. If she tells you she doesn't want to wear them then tell her she has to go potty in the bathroom and stand firm on it. Don't push it but be firm. Hope that helps, W.