ATs flops two pair but the wrong suit

[Aaron W.]

15-30 Bellagio

Three limpers and a woman on the raises from the cutoff. When she first arrived at the table, she raised a lot of hands, but showed down things like JJ, QQ, and AQ, so I have no reason to think she's doing anything silly. I call with AT diamonds from the small blind, the big blind comes along and it's 6 to the flop.

The flop is AT9 all hearts. While I'm thinking, BB checks as does an early position limper before the dealer is able to stop the action. What's my play?