well, at DS' 12month MCHN visit she told me that starting to walk is very 'normal' anywhere from 9-18 months. it also sounds like your DD has spent lots of time working on her vocab over the physical things. my DS walked at 12 months but at 18.5months still only says about 10 words.

i always think that it's cool to get stuff checked out if it's worrying you - just for peace of mind. but she sounds perfectly gorgeous to me