Standing

My daughter learned how to walk about 3 weeks ago. She does pretty good the only thing is she can't go from sitting to standing without pulling herself up on something. Is this normal. If she falls when she is walking she has to crawl over to the couch or something else to help her get to the standing position. She can bend down and pick things up and stand back up but just doesn't understand how to go from sitting to standing. Is there a way to teach this? Does anyone else have this problem?