Yuck...I hate messes.
First, this is a correctable error (not shooting a merited free throw), and it was caught in the proper time (before the ball becomes alive after the first dead ball). I believe the other item that applies is all other activity that happens in the meantime counts.
So, time has expired. B2 is disqualified and needs to be replaced. A1 shoots one free throw, with no one on the lane. A3 then shoots her double bonus, again with no one on the lane. Quarter ends. No time can be put on the clock unless you know there was time between the foul on B2 and horn going off.
As far as B2 being a key player, maybe we can start another thread on that topic...
