What do I do here? Porsche tourney 5 handed

[JustPlayingSmart]

**** Hand History for Game 1319972122 *****
Hold'em Trny:7995077 Level:17 Stakes (6000/12000) - Sunday, December 19, 02:56:25 EDT 2004
Table Porsche VIP Freeroll(173056) Table #1 (Real Money)
Seat 8 is the button
Total number of players : 5
Seat 2: mainsmart ( $230374 )
Seat 5: MIAMIWORM ( $35501 )
Seat 7: jessica0602 ( $94440 )
Seat 8: shark0984 ( $43024 )
Seat 9: Livertaker ( $65661 )
Trny:7995077 Level:17
Stakes (6000/12000)
** Dealing down cards **
Dealt to jessica0602 [ Ac 7s ]
MIAMIWORM folds.
jessica0602 raises [12000].
shark0984 folds.
Livertaker raises [15000].
asafuM: shes just playin her role...a great aggressive high stack
mainsmart folds.
jessica0602 calls [6000].
** Dealing Flop ** [ 4s, 5s, Ad ]
skillllet: thank you asafu
asafuM: u think she should lay off?
Livertaker bets [6000].
jessica0602 calls [6000].
** Dealing Turn ** [ 4h ]
skillllet: one voice of reason in here
Livertaker bets [12000].
jessica0602 calls [12000].
** Dealing River ** [ 2d ]
Livertaker bets [12000].
jessica0602 calls [12000].

My opponent in this hand was tight. He was the 2nd tightest player at the table. I think I blew this hand big time, but I don't see how I can play it much different. Is folding the flop possible? Is folding the river possible? Is raising the flop, and folding to a 3-bet or turn check/raise an option, and then checking through the river if called? That would save half a bet if I'm behind.

On the river the only hand I beat is A6, cuz I don't think he bets a pocket pair 88-KK after I call twice. I think maybe the best thing is to fold to the river bet, unless a big card comes that might allow a chop. I guess I am not good enough to fold top pair in a limit tournament.