[Izulde]

Ask her if she wants help cleaning the place. Make it clear that she gets to call the shots and you won't do anything without asking first. Hoarding/unmaintained house in many cases is about security and control and because she trusts you enough to let you in, you can build on that trust to proceed slowly and carefully with cleaning/straightening/helping her organize.

Once the place is clean (or at least cleaner), you can help her organize by creating a clearly-defined, outlined list of daily and/or weekly chores that will be easy enough for her to handle on her own.