How to make Mom's mattress more comfortable?

Would a 2 inch memory foam topper help?

Call your Hospice nurse ASAP to discuss. The purpose of the air mattress is to relieve pressure points. I was told NOT to add a mattress topper because it would render the air mattress ineffective in redistributing weight. There is a pressure adjustment on the air mattress; changing the firmness/softness setting might help. Also, there are several types of air mattresses. We had the one with individual 'pillow' pockets rather than long tubes and it was great! I raised or lowered the head of the bed every 2 hours for his comfort. And to allow Dad to lay comfortably on his side, I purchased a maternity pillow (because it cradled his body) which alleviated his lower back pressure. If that doesn't work, ask if the equipment (mattress or bed frame) can be changed.

An egg crate mattress topper may help too. It also helps prevent bed sores.

My sisters first bed from hospice was junk and needed to be swapped out.

Tell them to get her a better mattress.

Buy a sheep's skin from Amazon. It has done wonders for my dad's bottom

I want to say that all of the equipment provided by hospice is rental equipment and it has all been previously used, even the mattresses. Not replacing worn out items benefits the rental company. If you don't speak up they won't know to do anything.

Our experience was the bed sucked, it should have been disposed of before my sister got it. Her oxygen concentrator needed to be replaced. These were the only two DME items hospice provided. Obviously the rental company doesn't check the equipment. Shame on our government for not having procedures in place to ensure this doesn't happen at the most trying time in a families existence.

I had to get ugly about replacing the mattress and I had a long talk with the delivery man, so I know this is stand operating procedure.

I can't imagine the suffering needlessly endured by the people that can't say it hurts me. So we must all speak up.

At the advanced age of 94, your family member probably has very little fat remaining under her thin skin, and muscles have shrunken a lot. Some as need OTC medication for comfort may help, as can using something on a regular basis. Not necessarily morphine, though it can be used for that purpose. Ask your hospice nurse.
As a retired hospice nurse, I always told my patients/families that there was only 1 mistake they could make..the mistake was failing to call hospice when they had a question!

Talk to the Hospice Nurse. It is possible that there is a flaw in the mattress.
But there are pads that you can use to even it out a bit but make sure that the pad that you get does not restrict the movement or the airflow.
AND make sure that the topper you get is washable or that you get a washable waterproof cover for it.

LMRLMR: You need to speak to your Hospice nurse and tell that individual what you've written here. They should be able to assist you.

Get a Tempurpedic type mattress topper. Eggcrate foam is not dense enough nor is other types of foam. Basically, you should be able to sit on it and not feel lumps underneath.