What breed is she?

I have had this mare for about a year now and am just a little curious as to what other people may think about what breed(s) she is (I think she has some arabian or thoroughbred and pony in her) I will also put some pictures of her half sister (Same Sire) on here and maybe that will give you more Ideas on what she might be.Here is some more info on her-
Color-Gray? Height-Have to check tommorow Gaits-Walk Trot Canter(She looks and feels as though she is rearing when cantering at times[Kinda like an arabian in a Native costume show]) Gallop(Very fast) the normal Other-She can turn on a dime,Shes a fast learner,She has a short wispy mane but long and thick(ish) tail any other questions just ask!!
Edit-She is around 3 years old

I definitely see some TB. How tall? My old thoroughbred looks almost identical with smaller ears. I will find a pic..

Here he is. They have the same nose. :)

I will have to go out tommorow and measure her she is smaller than my arabian mare (but I don't know how tall she is either lol) but I suppose she will grow since she is only about 3 years old

I see tb, absolutely. In fact, if you told me that she was full tb I would believe you without question. Of course, she may have something else... I would probably discount any stock horse blood in her, she's way too light for that IMO. Maybe arabian, although I'm not too sure of that because arabian traits tend to be pretty prominent and she doesn't seem to show too many of the tell-tale ones, if any...
Possibly a type of pony, such as Connemara? Especially if she's on the smaller side. Those would be my guesses if I had to choose a breed other than tb, but honestly she looks like she's at the very least 50% tb, likely more... She would fit right in with a group of ottbs, haha.
Then again, I'm only good at spotting common breed traits, ha ha. Where did you get her? What breeds are most common where you live?

She is 14.1 hh and your horse is gorgeous lol

Im not sure where we got her from exactly but it was from a guy who said his neighbor had gone to Australia and left his horses behind so he took them in and all I know about there past is what the man told me which is they are half sisters (Same Sire different Dam),the most common breeds near where I live is stock horse breeds like paints,Quarter horses and Appaloosas we also have alot of arabian ranches (in texas) Here are some pictures of her half sister she is also pony sized probably a full 1 or 2 hands shorter than her sister

Yeah I would defiantly say TB

TB for sure she has the neck.

TB for sure! Probably with a bit of Arab influence as well.