I just took a better look at the picture and now I am thinking it's not a wyandotte, wrong comb! Then I wonder what mine is, I will post a picture of her, lol.
Probably a Welsummer. Could be a brown leghorn, they're the same color as Welsummers, but I'd think a leghorn would have more comb by now. If it's a Welsummer, you should get dark, terra-cotta eggs. If she has white earlobes she's a leghorn and will lay lots of white eggs.