Single female duck in garden, picked on by other ducks

Hello, we have a large duck population on our cul de sac but last night a lone duck has appeared in our garden and is reluctant to leave!! A couple of other ducks flew in and attacked her before I could shoo them away.

How can I help her? Any advice please. I have left food and water for her and she has had some of both. She is asleep in the corner of my garden but appears unhurt.

She has foraged about and has gone back to sleep now.

Thanks Rachel