It appears that she has taken ill with an auto-immune disease. It is called Sjogren Syndrome. I hope that she can make a recovery. It can sometimes be life threatening, but usually not. Unfortunately, the JW's will probably say that she needs to rely more on Jehovah to get better.
Sorry, but I have firefox and this site doesn't allow me to link websites so you will have to copy and paste into your addy bar...
http://health.yahoo.net/experts/dayinhealth/venus-williams-battles-sjogren-syndrome
Take care, Venus, here's wishing you the best, and please rely on the Doctors to get better.