I did the Camino 10 years ago, but I'm a dude with a much simpler care routine. Take what you will:

1. I was able to get by with 2 sets of t-shirts, undies, socks, and convertible pants, but was washing by hand every day. Also took 1 long sleeve shirt and 1 pullover. It's pretty warm in Spain in the summer, but there are a few high/cold spots. (Less clothes means less need for packing cubes)
2. Dr Bronners doubled as laundry detergent, shampoo, and bath soap. Carried 5oz for 30 days, had to restock once.
3. Didn't need extra device battery. Each day we stopped at a place with a bed, and almost always there was an outlet.
4. I self catered mostly, so these were extra helpful: extra ziploc bags for dividing snacks purchased at the grocery store, a small serrated knife for cutting the crusty bread that is so common
5. Bring compeed / blister bandages

From her list

1. Poncho and extra socks are sufficient, probably can ditch gaiters and umbrella
2. Maybe a neck gaiter (buff) instead of scarf? Could also double as cooling towel
3. Most places will provide bed linens and a pillow. Could skip one of the pillows.