Toddler potty training

Hello I am pregnant with my third kid and in the process of potty training my daughter she will be 3 in June anyway all I have to do is tell her to go potty and she goes she pulls on her Pamper sits on the toilet and potties but the only thing that I have a problem with is she won't get up unless I tell her to get up even when she's done she'll sit there so any recommendations would be helpful I don't know what to do to get her to get up on her own