I agree it would be very difficult, if not impossible to give any real accurate advice -- but from a very practical perspective, any alcohol consumed at this point is just one more additional task for her likely, already very overburdened liver.
http://www.chemocare.com/managing/li...ysfunction.asp
As Chuck said, in moderation, and in a comparatively healthy person, beer and wine can be excellent sources of flavonoids (powerful antioxidants); but nevertheless, the burden of neutralizing the alcohol falls directly upon the liver. It is probably far better to abstain from any amount at this point.
I hope she gets better soon. Take care. :)