One thing I didn't know is that they change colors not just over time but over the seasons. My daughter's Siamese mix looked like a blue point with some striping on her legs of the same gray color, but soon after getting her, her faint strips on her legs got a bit darker and when she came over to my cooler home for several visits, she developed a long dark streak from shoulders to tail and her coat darkened some. When I looked it up, the articles said that it's based on skin temperature so when Kitty is cool, the color darkens, and will subsequently lighten up again during warmer weather particularly when they aren't in constant air conditioning.
She looks more like a Tonkinese to me than a Siamese (or Siamese mix). I think she's a blue point. If she doesn't have registration papers in a registered cat association such as Cat Fanciers' Assoc. (CFA) or The International Cat Assoc. (TICA), then she's a Siamese-mix Domestic Shorthair.