I think moisturizing is going to be extremely important right now to help heal the skin, once its in better shape then less moisturizing is needed when using a quality cp soap.
I couldn't afford the expensive cerave moisturizer my dermatologist had recommended, so when the first tub I bought was getting low I decided to experiment and moisturized one leg with it and the other with straight coconut oil. Immediately after, the coconut oil leg still felt dry which disappointed me. But after a week, the coconut oil leg felt nice BEFORE putting on more oil while the cerave leg felt dry before putting it on. That was enough to convince me to stay with straight oils for mositurizing.
When my skin was so torn up, I was using the oil twice a day with the steroid. As things healed I was able to use the steroid less but kept up the oil. But over time I only needed to oil once a day. I also showered less, I don't shower more than every other day and I really only use the soap all over my body once a week, and stick to using it on my underarms and privates only in other showers. My soap sure lasts a long time lol! But I think this helped as well. Now I usually only need to mositurize all over after a shower, or if I notice my skin feeling dry in the winter. In the summer sometimes I don't moisturize after a shower and don't notice a difference.
I don't use straight oils anymore, once I had a bit more money I started making my own body butters with mixed oils and butters. I hope this can help her out a bit! It was an online forum that saved me. I posted on my german shepherd forum venting about how I was now allergic to my hypoallergenic body wash and Eucerin cream. People with dermatitis suggested CP soap and gave me links, and suggested pure butters like shea. So I started researching soap. I usually use very gentle unscented soap, but sometimes I use soap scented with essential oils. I stay away from fragrance oils since I react to so much stuff. And avoided the EOs until my skin came under control.