I'm sorry, I don't have first hand experience hiring help in the home.
You can place an ad, or talk to the placement office of local nursing schools, but then you have to deal with screening candidates yourself... which is difficult to do successfully if you've never done it.
Mostly it sounds as though you need someone to be with her and able to do household chores (cooking and cleaning?) when you are not there and when hospice is not there also?
Sorry I'm not more help. And, yes, no one can give the same kind of care you can... but you definitely cannot do it all yourself and work, too.
Ask the hospice folks for suggestions and referrals, maybe they can hook you up with someone.