My mother in law's infections: MSRA

I am concerned about my mother in law's health and care right now. This all started with a fall at the end of February 2020 she broke her femur in the fall and had surgery to repair this. While doing the femur surgery it was noticed that her knee replacement from years ago was having some issue so they fixed that as well. She went to a rehab facility and after 2 weeks there we found out the incision was infected, she had surgery again to remove the infection and the knee replacement. She was put on IV antibiotics for 6 weeks and the plan was to put her knee back in so she could walk again. After the antibiotics they were concerned about the wound site not healing properly. Surgery was postponed for 2 more weeks. During this time we had many issues with the care facility she was in, we believe she was being drugged and possibly abused and definitely not being taken care of correctly. So we moved her to another facility where she was showing great improvements. Then infection was found again in the knee, surgery again. We were told the infection was so great they would never be able to get it all out of the leg so our best option was to amputate just above the knee. So that surgery took place and she was sent back to the rehab place she was good for another 3 weeks or so and the amputation site started to ooze blood and liquid of some kind. So surgery again to find out she had a pocket of blood in there that was drained and the are was flushed with antiseptic liquid. A few days later infection set in again. We were informed yesterday that the antibiotics she had been on for a week were toxic to her body they have switched the medication and waiting for the bad ones to be flushed out. We were also informed that the infection tested positive for MRSA. She is now on 3 intravenous antibiotics and is not doing well, very weak, can't eat or talk. We are told that after today or tomorrow the bad meds should be cleaned out of her system. At this point we are so frustrated with everything and want a second opinion as we feel something is being missed somewhere. We were told that there is nobody available for a second opinion due the the amount of COVID cases in the hospital right now. What do we do and do we have any other options at this point.