It seems as though your little girl is up & away now, so I'd just like to say a big congrats! You will be so relieved!
I'll add my little story for you and any other parents in a similar situation ( which is why I also went through and read all your replies!) My DD is 22 months next week, and has only started walking in the last 2 weeks! I was soooo worried also, but now that she's up, she hasn't looked back! It all happened so fast! She has been a bum shuffler too, and our doc's said the same thing, if they don't crawl, they are not in an ideal position to lift themselves off the floor.
She does however have ankles that roll inward, and although our CHN said it is just a balance thing that she will grow out of, I'm now thinking I'd better get her looked at in case she needs orthotics or special boots, as DH needs orthotics for flat feet. So thanks ladies for that suggestion to the original poster.
Sarah 3/11/05 & Kade 6/11/07