AQ v. MP Limper -- No Piece Of The Board And Limper Bets River

[Knockwurst]

Local B&M $10-20. TPA (who deals (cards) at the club) limps from middle position, folded to me in CO, I raise with A [img]/images/graemlins/heart.gif[/img] Q [img]/images/graemlins/diamond.gif[/img], SB folds, BB calls, limper calls. 3 players -- $65.

Flop is J [img]/images/graemlins/club.gif[/img] 6 [img]/images/graemlins/club.gif[/img] 2 [img]/images/graemlins/heart.gif[/img]

Checked to me, I bet, BB folds, limper calls. 2 players -- $85.

Turn is 5 [img]/images/graemlins/diamond.gif[/img]

Checked to me, I bet, limper calls.

River is 10 [img]/images/graemlins/heart.gif[/img]

Limper bets out(?!?). I fold(?1?). I know she's a dealer, but based on the fact that in two hours she seemed to play straightforward and never get tricky in any situations, I folded. Was it a chump play? Do you almost always call down a river bet with A high and a non-threatening board -- even against a TPA?