Potty training help!!!

Ma

We started potty training my LO two days ago. She is holding her pee in. We’ll sit her on the potty every 30-40 minutes and have her sit for 15-30 minutes and she just won’t go. I know she’s had enough fluid. She’s gone once and she’s not scared of the potty, but I think she’s waiting for sleep time for the pull-up. We’ve tried turning the water on, making the “psssss” sound, showing her a pushing face and having her make one to push, Ive peed in front of her, offered stickers for her chart, and even had her drink water on the potty. Any other suggestions? I don’t want her to hurt herself by holding it in 😩