Is there any low-cost or govenrment-subsidised vet care available in your area? Do any local shelters have arrangements with vets to do the tests or spay/neuter a lower price?

In South Africa we have the PDSA (Peoples Dispensary for Sick Animals) - it's a vet service for people with low incomes etc.

Although that will not realy help if it is a LACK OF UNDERSTANDING / KNOWLEDGE and not a FINANCIAL PROBLEM.

We have problems with well-meaning people here who feed colonies of feral cats, but do not provide any vet care and do not TNR. They dont realise that they are making the problem worse, and not helping! They feed these strays, which are then healthy enough to deliver and nurse large litters,,,,,, and so it continues. Without either TNR or natures "survival of the fittest"to keep numbers down the problem is exploding here.

If she is feeding all these animals that show up at her house the surely her heart is in the right place. I hope you can pass on the info in such a way that she will accept your advice and do something about the rest of her cats!