Both my DDs were toilet trained before 2. DD1 took about another year to be dry at night but DD2 was out of night nappies about a week after training during the day.
DD1 was 19-20 months and DD2 22 months. They both "got it" within a week apart from the very occasional accident.
All children are different though and DS has taken a lot longer. He was 2.5 before we started.
Is she showing signs of being ready apart from the pain? Poor DD