On a walk, the lookback rule is "off" for all runners on base until the BR reaches first base. Once the BR has touched or passed first and the pitcher has the ball in the circle, the lookback rule is "on" for all runners on base.
In your situation, once the BR reaches first, B1 needs to commit one way or another. If she just stands there and the pitcher is not making a play on either her or the BR - she is out!
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