Splash overo, her off-centered face marking is indicative of that. But if you were breeding her to a LWO+ stallion, I'd definitely have her tested for frame, because she could be carrying it.
Anyways, Tobiano the white markings come more from the top, and it does not cause face white nor can it cause blue eyes. Overo the white comes from the bottom of the face, causes blue eyes but does not always have them, also causes face white.
My vote is frame (lwo) I have a simular marked mare that is from the Rowdy line. She too has a facial marking that is offset and does not cover both eyes. One eye is blue the other is brown because of it.
I would definatly test her before breeding. My mare had been bred to another frame prior to my getting her and had a lethal foal that died. The previous owner did not think to test her as her markings were so minimal.
It is best just to test, that way there are no questions. I don't think the mare shows any frame characteristics besides the blue eyes. The face markings could be caused by either splash or sabino. Frames(if they don't carry other pinto patterns, usually don't have white on their legs at all, but mixed with other patterns, it can all change.