I'm typically just completing the SB in this situation PF, although a lot of people seem to like to raise the small pairs to build a bigger pot in case they flop a set. I'm definitely not in this camp but it does hold some merit. As DG said the flop bet could certainly be bigger but it's by no means too small.

Since you seem to know the BBs game pretty well have you seen her slowplay sets on draw-heavy boards in multiway pots before?