Played this hand over the weekend at Harrahs Atlantic City in a 1-2 NL game. I had 99 in middle position and raised to 6. A girl in town celebrating her 30th birthday raised to 10 from the small blind. Flop was T 4 2 rainbow. Birthday girl bets 15 and I call. Turn is a 6. Birthday girl bets again for 20 and I call. River is a 7 and birthday girl throws in a 30 dollars. I call again and she mucks before I show my hand. I know it seems like I put a lot of money in with 99 unimproved, but based on the way she'd been playing it was almost certainly a bluff. On the flop, she started to check and then when she realized it was heads-up, she bet instead. Sure, it could have been an act, but it seemed like she was giving up on the hand and decided to try and take it with bets. In hindsight, raising on the flop was the correct play, but I definitely got more money with this play.