Until your friend learns to change habits and the things that are valuable and supportive in her life, there will be no help for her. You could suggest to her that space is a thing of value, just like an old newspaper, and ask her to consider if there is a place in the house she could save space.

Hi Kathy 🙂

Unless your friend wants help nobody can really help her.
A good way for you to start helping her is to read
"Digging Out".
Also, click on the links at the top of this page and read around. Lots of good information here.
The red "hoarding blog" directly to the right also has some good information.

Best wishes, Tillie