As you surely know, she is a point and a tortie, so tortie point, domestic shorthair.
She is a decent look alike to a siamese (or a pointed Orientale if there is such a thing as a pointed Orientale - the exact labels depends on the organisation).
So may guess will be, she has a recent ancestry of a siamese, or is what you may call, a siamese-mix. Not just as a matter of speaking to label a point of uncertain ancestry, but here - for real.