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[EdJW]

If B3 is the next batter in the lineup, B2 is out for abandoning her "at bat." And count on B3 is 1 -- 0.

If B3 is an unannounced substitute, she is out upon completion of her "at bat." This occurs when she is awarded first base with the BB. The defensive coach is required to bring the issue to the umpires, which the coach did in this scenario. Upon confirmation that B3 is an unannounced substitute, B3 is out.

If B3 is an announced substitute, she gets the BB.

B4? There is no B4 in this scenario.