Okay, I'm not sure whether this is right but here goes. Everyone's interpretation of poetry is different and your response is the one that matters...
It seems to me that this poem concerns the differences in our life and the chaos a lover can bring when they arrive in our life. It's like autumn, all leaf litter scattered everywhere. It also seems she is equating winter with purity and wishes it was that season. Alone, life is uncomplicated.
So to avoid the upset and strange feelings love will bring, she retreats into herself. Becoming a spinster perhaps not for real, but in her head.