Medical air mattress for sick aunt

My aunt sue whom is 66 years young is a loving mother of 4 and everyone who comes into contact with her loves her because of her warmness and kindness, unfortunately she was recently sick and hospitilized due to her pressure sore in between her tailbone and buttocks that she has been suffering with for 4 years now. The infection got so bad it made a hole in her backside the size of a fist which makes it unbearable to sit or sleep on. She was hospitalized for 3 months for the infection and has been in rehab for 1 month so she could regain her strength to walk again. She is needing the special medical air mattress at home with her where her daughter will be caring for her so that pressure sore can heal and she can recover. This special mattress takes the pressure off of her backside so she can heal and be at ease and stop suffering. These medical beds can be costly around $20k but we managed to find one online for around $5,000. Anything is really appreciated at this time we are desperately trying to get this for her so she can be removed from rehab and we can bring her home. Her insurance only covers a regular mattress, thank you and god bless you all please if anyone has any other useful suggestions or idea please let us know thank you again!!