Is there not a No Kill shelter or rescue anywhere near you? A lot of cats stay as outdoor cats but she so needs to be spayed. Each time she has babies and they are left outside and unaltered they multply as well. It is a never ending battle. If there is a rescue or no kill shelter around maybe they can help with getting her and the babies trapped and vetted and altered if nothing else.

Keep us updated. I know the struggles of this. We don't have a ton of money and right now we are trying to help a feral mamma and her 4-1week old babies. There is nothing here to help with cost for vetting and altering. That is something we have to look after ourselves and it is very expensive. About €300 for each. It is outrageous. We are joining ENPA this week to see if they can help us out with vet cost as they are strays.

Good Luck and try the no kills and rescues.