Should I have done a Stop and Go here?

[nthn2fancy]

Villian was very aggressive and had built her chip lead by stealing blinds.

PokerStars No-Limit Hold'em Tourney, Big Blind is t40000 (5 handed) converter

Button (t944728)
Hero (t381642)
BB (t525432)
UTG (t454624)
MP (t404574)

Preflop: Hero is SB with A[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Button raises to t120000</font>

Hero? Push? Fold? Stop and Go?