My mom's rash didn't seem to get as extreme as what you are describing. However, it did go into the extremely dry skin. Mom would say when she rolled over at night in the bed it would feel like her skin was tearing it would hurt so bad. Now, her skin is so soft! It was a couple of days after using the LindiSkin that it really started showing improvement, and now it's just like it used to be. But when it was so dry it was peeling in really big pieces like peeling from a bad sunburn as you described. She could literally pull off strips of skin. About the time she started using the LindiSkin products, she also dropped her Tarceva dosage from 150mg down to 100mg. I think the combination of dropping the dosage (at her request - not the doctor's idea - she told them either drop it or she was going off) and the Lindiskin is what pulled her through.
If your mom can tolerate the Tarceva, I really think it would be good. I'm not sure if I mentioned in my previous post, but my mom has been on Tarceva and Gemzar for 6 months. Her CA19-9 has dropped from over 38,000 to 44 last week. The doctor believes three more weeks of treatment and she will be considered in remission. This from advanced PC without hope of any surgery, and being given 3 months to live without chemo!