im lucky my cat is an indoor cat so I don't have to worry about this but my mum has the problem of a neighbours cat that craps in her garden, if she see it she scares it away but even so she doesn't come across that much cat poo and tend to just chuck it in the outside bin if she does find it, so there must be more than one cat pooing in the woman's garden if she's finding that much. if the spray isnt working im sure there's some pepper stuff you can get especially if she doesn't have animals of her own its good for keeping all animals from the garden, I remember my mum having it but not sure what its called but my mum said it makes it uncomfortable for them to toilet in those areas. she cant expect you to go pick up crap everyday when you have young children to look after, maybe she has something in her garden that attracts cats as I doubt its just yours. putting cat faeces on your path or driveway is disgusting especially as you have young children, she obviously need to find something better to do with her life than hunt for cat poo. out of interest does she have any pets or children?