Help! My moms a hoarder and we have a big project to clean her home. Advice please?

My mom was a vibrant full of life happy person a few years back. She started hoarding a little after the divorce from my dad about 12 years ago. With ups and downs with depression, she finaly got back on her feet. Well these past 3 years she has gotten very ill. She suffers from diabetes, high blood pressure, fibro myalgia and has a herniated disk in her back. I have a busy fast paced life with my husband and 3 kids so dont have much time to help my mother out even though we live a city apart. She has a beautiful home but started hoarding so much, she had to move out. She moved to an apartment and we barley got that cleaned up recently with some more hoarding she had done. I dont know where to start. My daughter and I went to her old home this past weekend and saw it at its worst. The home is abandoned and we cant even walk into it with all the clutter. The power went off about 2 weeks ago and we just found out her old fridge had food that was 3 years old in there which has now rotted in the heat. I am afraid to open the fridge and find a bacterial disaster. There is no running water either. I want to start cleaning it out now. I have decided to buy face masks and gloves, and maybe wear long sleeves when we go in. What other precautions should we take and how do we start this clean up project? We dont have the money to get a huge dumpster out there or a specialist. I would like to keep her furniture that has been sitting there but is it salvagable. It has been abondoned for 3 years and my mom wants to sell the home as is. The cieling has mold. Well any advice would be appreciated. Thanks.