I believe it is quite normal to walk with an in toe gate during that age. My ped would not let me see an orthopedic dr because it is so common. I've been to a PT for some exercises to do at home. Also make sure your dd doesn't sit in a ww, but instead sits criss cross. I do second the orthopedic dr and maybe a different PT. I am due to see my ped for my daughter's 2 year well visit, and I plan on asking for a referral to an orthopedic dr just in case.
Here's some information from dr sears that seems to make sense.
http://www.askdrsears.com/html/10/t107100.asp