If already adult and over one year old bring her to vet and spay, if no the longer you delay the chance getting breast cancer is higher

Sos
My cat kena before, and vet said chance for coming back is possible , if my cat still have all the strength and condition is okay will bring her for 2nd time breast cancer remover if coming back, but the chance is low to survive for 2nd time due to age according to my vet, so either just leave it like that or bagi tidur if coming back

Tldr
If can bring her and spay