If an old lady is not spanish citizen she won't get free treatment. A wife or a girlfriend can get free medical treatment from insurance of her husband or boyfriend only after proving she lived for a year with him in spain by paper and not earlier, they have to be registered under the same roof for a year to get free treatment. Then you should marry this old lady, wait for a year and then she will get free treatment, then divorce her after she is healed and marry your real girlfriend. When I was in spain I had to pay 80 euros only to get an anthibiotics prescription from my cough, nothing is free for foreigners there.