P.S.
Try playing "Let's see the peepee/poopy". Have her sit on the potty and then after a few seconds, tell her to get up. Then say "Let's see if there's any in the potty" like its a big mystery, and then together look in the potty. If there's nothing, sit back, shake your head and say "Oh no! No pee pee." and have her sit back down again. After a few seconds, look like you heard something and say "I think I heard something. Let's check" and then have her stand up again. Keep doing this a few times and after a few minutes, tell her "Ok. Maybe next time we'll see something!".
gl