Potty training

She i started potty training about 3 weeks ago and it was going well, she will wee in the potty and let me know when she needs to go. However I'm having issue with her pooing her knickers, the first time i explain to go in potty but it's all the time now. She don't show signs she needs to go a poo, she doesn't push, it just flows out of her. She drinks so much water her wee is clear. I thought she was scared but now I'm not sure. I have done reward charts, stickers, vidoes, YouTube, i even put the poo in the potty and got her to sit on the potty and then wipe her bum and flush it down the toilet. i'm at a lost on what to do. I'm waiting for my health visitor to speak to me.

Anybody else having issues or any advice would be helpful.