Han, really? I thought Luke, if anyone.
I mean, she got those random visions of him, is connected to his lightsaber (oh man...not changing the wording), Maz made numerous references to lineage when discussing her being left alone as well as the lightsaber generational tradition, on top of her massive use of the force despite never once being trained in it...
I think it's pretty obvious, but like you said, I'd love to be proven wrong and she is just a natural-born talent with no connection to anyone.