Talk to Pediatrician on Child Psychic

I'm having a 3.4 years old daughter. She is v sharp v observent v sensible n understands everything. But I'm facing problem to train her for toilet. Wen I remove her diaper she holds her pee n poo, even for many hours. Sometimes she asks me to put on the diaper as she needs to pee or poo. She has a control n also tells wen she feels a need. But don't do it in washroom. Although I washes her in toilet 🚽 on comode. But she shouts alot wen I ask her to do it in toilet. I want to train her for toilet 🚽.