So Biscuit went and pulled a fast one on me.

She went and made a nest, pulled fur and the whole works. No kits...which makes sense since she's not due until the 21st...unless German got her through the wire (1 x 1 so highly doubtful...) but the timing would be right on....

Do I wait for her to get over her grumpies before rebreeding her or ??????

One of my does did the whole better homes and gardens thing almost three weeks early. It was ridiculous . I put the box in for her and it sat there until she kindled. I had read on here someone else had the same thing happen. She was pregnant and this was her second litter. I guess as soon as she knew she was pregnant she went into mother overdrive. She did not do a repeat performance with her third litter. I would not give up on your doe yet.
I would count her as ,until after the due date just to be safe.

I'm with Currituckbun... does are good at keeping you guessing. You should give her usual pregnancy time + 5-7 days, just to be sure. If you rebreed her now, she could end up with a double pregnancy (the uterus has two horns which can initiate separate pregnancies), in which case both litters would be lost.

I know I've had does nest early (not quite that early, but still...), and I think they have a false pregnancy, and they end up with kits. It's actually been a false pregnancy only once.