Welcome to BYC. Was there a buck in the pen with her ? They will rebreed immediately after giving birth. My gut instinct is that she is still hormonal and 'mother' protective. I'd just let her work her way out of it.
Her babies were born Nov 10 and we took her and the babies out immediately. We didn't realize she was that close to delivering and saw them about 3 hours after delivery. After the babies died she started making the nest and got aggressive. She is by herself right now and charges us when we feed her.