If the swan hisses at you, then it probably will not let you get near her, much less pick her up. She will not go into the shed on her own. Even if you chased her indoors, once you let her out the next day, she would leave the area or never go back indoors again. So, she is pretty much on her own.

Swans are built for cold weather so she should fare okay as long as predators leave her alone and she can keep warm and dry, eat the food that you give her and can still browse in other nearby areas for water, food and shelter.

Yes, most birds (various species not just swans, go south for the winter. The Regal Swan
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