I know from experience these side effects can be extremely debilitating and
uncomfortable. I spent 2 weeks not being able to walk any further than from
lounge chair to bed to loo. It is called Palmar-plantar erythrodysesthesia.
This link has some ideas http://www.cancerlynx.com/doxil.html but I found
putting my feet (and hands) in cool water and using icepacks was most
effective for me. I also had a cool shower twice a day, and didnt use any
soap, but rather a soothing lotion/cleanser. Applying soothing creams worked
for about 5 minutes (I found them of little value).
With me, once my feet and hands started to peel, the pain went almost
immediately.
My thoughts are with your lady as I know how extremely uncomfortable this
can be.

This is going to sound a little weird, but I used Bag Balm - available at
most animal feed stores.   The lanolin in a heavy base was soothing and there
is a triple antibiotic to help prevent infection.   I used several pair of
heavy cushioned athletic socks and put on a good coat [the socks will be a
total loss, so don't use your best ones].   Anyway that is what worked for
me.

George