How do u potty train a girl who is scared to sit on a training potty and scared of water?

Parenting. Carefully with compassion and patience.
Specific phobias . can occur in children with other anxiety disorders , Autistic Spectrum Disorders & Tourette Syndrome, often with a + family history. They differ from childhood fears because their intensity & severity harmfully impact development/academics, peer interaction & behavior.Ask her pediatrician for referral to a child psychologist before resuming toilet training. .