another slim value bet commerce 20 40

[ShortySaurus]

Villain is a 40 year old korean woman. (I have no idea what that means.....i guess ABC and doesn't bluff) I am CO with A4o. Villain is SB. I have been pretty aggressive as the table is really passive and loose. Anyways, MP limps, I raise, SB calls, BB folds, Limper calls.

Flop is A 9 8

Checked to me, I bet, SB calls, limper folds

Turn 6

Villain check calls

River 7

Villain checks.....and I BET!!!!!!

Who just checks behind? What do you think of the bet?