I've heard of people doing three things to lessen the injury from falls:
(a) putting the mattress./boxspring on the floor (eliminate the frame)
(b) putting another mattress on the floor right next to the bed
(c) using an absorption pad*
It is common for facilities to consider bed rails restraints. The same facilities usually allow a "bed cane"** to be used. You might ask about that.
Would your mother use a call button appropriately to indicate she wants to get out of bed?
Is it possible for your mother to have a sitter while she's in bed? The sitter can be in the other room with a camera on your mother for monitoring.
Also...why is she trying to get out of bed? If it's to go to the bathroom, then consider a medication to deal with nighttime polyuria. I think there's a drug based on desmopressin -- something like DVAP.
* Someone on an online support group recommended this bath mat because it can absorb "up to 93% of impact forces from a fall." I have heard of the company before - Posey. They make a good gait belt and some incontinence bed pads.
Here's a description of the bath mat, which is in their Fall Protection product category:
The Posey Sure-Step Cushioned Bath Mat is designed to create a safe environment in damp, slippery areas. Made of soft, durable PVC and capable of absorbing up to 93% of impact forces from a fall. Impervious to water, oils, grease, brines, acids, alkalis and bacterial growth. Easy to install and can be cut to fit any size bathtub, shower stall, or bathroom floor. Meets UL94V0 flammability testing.
It comes 3' wide, and in various lengths (4', 5', 6', and 8'). It's $100 for the smallest size and $200 for the largest size. Pricey stuff.
Go to www.posey.com
, and enter 60224 in the box next to the word Search. Then click on Search. You can see several pictures of the mat.
** A good one is: BedCane from Standers, Inc. (stander.com - company name ends in S but the web address doesn't). The handle is wide, very sturdy, and somewhat cushioned. The handle attaches to a solid wood base, which is tied to the mattress. The whole thing is very sturdy. I think we paid $60 for this.