Female intact petite silver tabby

Siren is sixteen months old, She's a wonderful girl, clean, affectionate, petite, She did have a surprise litter and she birthed and reared them amazingly.
Unfortunately our family circumstances have changed and I need to reduce my pet family.
Siren is vaccinated and microchipped.
Her mum was a Persian cross BSH but not sure about her father.
She lives with another cat and two dogs, she's cautious but inquisitive, She follows us on our dog walks, she goes outdoors to the toilet, She's never been poorly.
It will break our hearts to say goodbye but I truly can't afford to keep her.