If she can find a homoeopath who will give her a staph remedy over the counter or online it would be very inexpensive.
Our homoeopath makes us a strep/staph remedy for our horses if they have infections. Solved a nasty bone infection in one mare that wouldn't respond to antibiotics.
This woman is in Australia, but ships all over the world - she is a certified animal homoeopath, but as they use the same remedies as people it is not an issue. If cost is the issue, she is very reasonable, and very knowledgeable - just get your friend to email her for advice. If she can't help, (don't know if she is allowed to treat people) she will know someone who can.
www.wholisticanimal.com