K.D.
My dughter is also very short and little. We never used a self standing potty. She wanted to be like mommy so she sat on the big potty. We just bought the seats that go on the big potty. We have the dora and seasame street ones. She never goes to the bathroom herself so I just put her on it when she needs to go. We do have a stool also but that seemed alittle diffucult for her.
Then when we are out and about.We have a foldable one that goes on public bathrooms. She has done great and never looked back.