D.S.
I do not have any idea, but toddlers go through so many weird stages, like my 2 year old daughter, she took her sweet time to start walking my husband and I thought about physical therapy... she also likes to sort all her toys by size and color, go figure!
I am sure your daughter is fine and the peditrician will only ease your mind.
I live in Grovetown, where do you live? Maybe we can get together for a playdate!