ramps everywhere needed.....
non skid surface in bath tub
pill dispenser...days of week and 4 times of day kind.... set up pills for entire week at a time... you can quickly observe if she is taking them... and makes it easy for caregivers to pour out the pills for the day and time and give them to her...can avoid lack of proper medication or double dosing... seems simple to take pills, but with numerous caregivers and sometimes confused times and days and changing medications, and confused patient... best to seek a fail proof system (none actually exists, but you can go for best practices)
raised height potty seat
MULTIPLE grab bars in bathroom and bathtub..placed for HER height, etc... determine placement by having her approach bathroom, get into tub/shower. Notice where she naturally wishes to place her hands... of course, you will be assisting her for this trial run.
Use masonry bit for drilling holes into tile... a hammer drill (think Harbor Freight tools) is ideal for this... silicone caulk the holes/screws in wet areas.
non skid surface when getting out of tub/shower
shower seat for tub...
Long hose from shower that is hand held so she can direct water herself
place to set supplies within reach... shampoo, soap, etc...
bedside table for all kinds of stuff.
At Radio Shack, and other places, there are automatic phone dialers that are actuated by a remote locket that she can hang around neck on a necklace/string. By pressing a button, it signals the dialer to dial up to 4 different numbers with a recorded message..."this is your grandma... I need help".... no monthly charges for somebody to call 911 for you.... typically, with all us us carrying cell phones now, you will have 4 different people who can be on standby... first person answering call breaks the call chain by indicating they have heard the message and will respond...
My folks were far sighted, realizing that their physical prowess was waning, suggested we get a ramp van about 15 years before my mother passed away..at 92...dad is still going at 96. GREAT THING TO DO.... makes vehicle entry and exit soooooo easy... for walkers and/or wheelchairs... saves your back

Yes, pricey, buy van, then spend $15k to get it converted...paid for by NOT having to strain all the time when going out. What else are you going to do with the $$ but make life a little simpler for everybody concerned with the welfare of aging relatives. As you can see, I'm sold on a ramp van... if you need more info, PM me.
wireless phone, perhaps several, so she can have it beside her in bed, in the easy chair, carry around... put key numbers on speed dial...
Medicare will pay for wheel chair if long term mobility difficulty is anticipated... worth getting as soon as qualified.....in case of inability to use walker, then transport to doctor/hospital becomes possible without 911 call....as long as you have ramp van.... for those times when person is weak, putting them into wheel chair in the house where you have room to lift and navigate, rolling up to ramp van, into ramp van, drive to location, down ramp van and right into medical facility, right into office....NOTHING BETTER for the caregiver.
Been there, doing that... recovery from broken hip, long rehabilitation period. Keep her in hospital/rehab facility as long as possible... home rehab is much less time with patient, less effective, etc...
Best wishes for you and grandma and all the caregivers. Also, good time to get various affairs in order... wills, non-resuscitate...estate planning/transfer...never pleasant to do, but better now than later..