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The subject of intentional breeding or meat rabbits is prohibited. The answers provided on this board are for general guideline purposes only. The information is not intended to diagnose or treat your pet. It is your responsibility to assess the information being given and seek professional advice/second opinion from your veterinarian and/or qualified behaviorist.
My one wasn’t grumpy at all during her pregnancy – infant she suddenly became cuddly which she never was before so I wouldn’t rule it out based on that 
I would have her checked by a vet though – she could have a illness or mites or anything since she was abandoned and you’ll need to know these things to know what may pass on to the babies or what treatments she can have while pregnant for anything she may have.
I would also have her spayed after the kits are weaned ( if she turns out to be pregnant ) as cancer risk is reduced a great deal