Potty training a girl?

i have a 2 1/2 year old girl who began potty training herslf. she knows EVERYTHING about the big potty and how to wipe and flush and yada, but she goes threw all the motions but wont actually pee or poop in the potty, why is this? ive kept her naked all day adn she only peeed durin her nap and once she hid under my table and peed but thats it, shes dry all day other wise not one accident, i was hoping for some tricks or tips bc she knows what she is doing just snt actually peeing ahhhh lol