I don't know what breed my kitten is?

I have a kitten who is 17 weeks old. She may be a mix, but I am not sure. When we got her at Petco they said she was going to have medium length hair. When I looked online for cat breeds with medium length hair, I couldn't find anything. Only breeds with short, long or curly coats. She has big ears with ear furnishings and roundish eyes. Her whiskers are very long and her body is longer than it is tall. She is very Petite with small paws. She is a calico (grey, white and a tanish peach. White being the dominant color.) Her face shape is also slightly triangular. She may be a mix but I don't know. I will try to get a picture up as soon as possible, or at least a link to a picture.