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I don't know for sure but if I had to say, based on her behaviour, spayed bitches can still be affected by season hormones..
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For no reason in particular I had a chat with my vet about this the last time I saw him and he confirmed that it is documented in the veterinary press that spayed bitches can still be prone to cyclical variations in mood/behaviour. Can't recall exactly what he said, but think some of the postulated causes include possible residue of tissue left behind and time in the cycle when spaying was done - hormones' effect on/by the pituitary gland in the brain or something
Whatever, I hope that matters improve for you and Dora soon.