N.M.
I bet that watching the kids at preschool using the potty will motivate her. My son used the potty the first time in when he started daycare and saw the other kids doing it. He was 2. My daughter is already starting because she sees her brother and the kids at daycare -- she's 1. Don't stress about getting it done before preschool. See if preschool does the work for you. Good luck!