Loving Dog Needs Loving Sitter/walker

Molly is a beautiful sweet 6 or 7 yo 92lb pitbull rescue. My partner rescued her 4 yrs ago. She had been hit by a car and was found on the highway so we have no history. Molly is the sweetest, most loving dog and stayed by my partners side or on his lap for the past 2 yrs as he battled cancer. My partner died on July 4 th and Molly became my responsibility. I love her but Molly is dog aggressive. She cannot be around any other animals and I need to help take care of my mom and my grandchildren who all have dogs of their own. I need someone who can stay overnight once a week so I can go to them. I will need to go for extended stays 2-3 times a year as well, for 5-7 days each time. I am also looking for occasional dog walking ( actually taking Molly in the backyard to pee or poop and play as I dont want to risk any issue with otger dogs on the street if walking through the neighborhood).