Been there done that, expect to do it again in a few years.
First things first...
Take care of YOU and don't feel guilt for it. Seriously this puts a ton of stress on you and you need to take breaks. Too often people taking care of parents and family forget themselves in the process.
Next thing,
Especially since she's in the hospital get some help and go through that house while you have the chance. It's way more difficult with them there. Anytime they are not there is a time to get things done. Get things set up to make things easier for you. Does she have a chair that's difficult to get in and out of? Get rid of it before she can't get out of it. If you need it, be prepared to hire someone to come in once a week even, that alone can help, spread the cost among the others who don't live nearby, make it part of their contribution and insist on they help, otherwise they probably won't as they will have no idea how much this is being put on you. If they don't want to help make sure the will (there is a will right?) reflects this, that sounds crappy but you'd be surprised how sh*tty people your siblings can be when money is involved. If they can't kick in $50 a month now expect them to fight for every dollar later, so keep receipts for EVERYTHING.
If it looks bad on the surface, expect things to to be way worse as you dig in. Check everything, heat, air, water, stove... Check her bed. My grandmother had been using the same matress for years, when we went to remove it we found coils and wires poking out all over, how she slept on it without being constantly stabbed we have no idea. It was also really easy to fall out of because the way it had worn almost pushed you out of it. We had to get a fence to keep her in, once the matress was replaced she no longer needed that. She also (surprise!) slept better, something she had been fighting for years.
And do not be afraid to take her car keys, seriously, people wait far too long to stop driving. My grandmother knew she wasn't good to drive and gave them up willingly, both of my grandfathers were fine till the end.
If she has memory issues, even minor ones, get ready. If she has a fireplace, block it off. We were almost killed when she forgot about the flue. We bought a carbon monoxide detector the next day. We eventually had to watch her cooking as well, she'd cook and reheat the same chicken dinner over and over again, eating a few bites then stick it in the freezer and do it again the next day. Expiration dates mean nothing when they don't understand time or dates anymore. You may need to take a more active approach to her diet and that includes doing all her grocery shopping. Also once they get a bit deeper on this, do NOT move them to a new place, they get in a routine and changing it just destroys them and they may not recover, they don't adapt to change well. If you toss something don't even tell them, just do it (hidden) and act like it was never there, use that memory loss to your advantage at times, seems mean but it's easier than dealing with the fallout. Memory issues brings a whole new slew of problems to driving, my grandparents went to dinner at a favorite place 10 minutes from home and got lost for almost an hour, you need to revoke driving for memory, not just bad driving. Also expect them to become full on children again, extremely petulant ones at that.
It was rough but putting her in a home was the best thing for her and us, even after she took the hit from the change. We no longer worried about her falling without us around, eating the wrong things, using the stove, using the fireplace, bathing... We didn't realize just how much stress was being put on us. The sad part is we took too long to do it and we actually did it sooner than many people would have.