That link doesn't work for me. But, I'm guessing that her condition might be helped best by homeopathy remedies. A supplement, of course, is great too - and Only Natural has really great ones.
I had some bad issues w/ Marcel and finally sought a phone consult w/ a pet nutritionist - she is very versed in supplements and some homeopathies. I wonder if she'd be worth a try for you? She worked a miracle for Marcel - so who knows. You can read about her here:
http://www.askariel.com/