PFR cat-and-mouse?

This may be a major leak of mine - I won't tell you what I think I'm doing wrong until I hear some advice on the hand.

This was my first orbit, but I had used PT/PA to help me with seating, so I know that SB is a big LAG - 56/22 to be exact. Couple this with an annoying trend of people between CO and BB raising a multiway but unraised pot with stuff like J6s and K7, and I'm not gonna give her much credit for a hand. Should I have?

Party Poker 1/2 Hold'em (9 max, 9 handed) FTR converter on zerodivide.cx

Preflop: Hero is BB with J[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/spade.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, MP1 calls, <font color="#666666">2 folds</font>, CO calls, Button calls, <font color="#CC3333">SB raises</font>, Hero calls, UTG calls, MP1 calls, CO calls, Button calls.

Flop: (12 SB) 6[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(6 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">Hero raises</font>, UTG calls, MP1 calls, CO folds, Button folds, SB calls.

Turn: (10 BB) T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, UTG folds, MP1 calls, SB calls.

River: (13 BB) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero...?