First of all - good for you that you have your will in order. do you also have power of attorney and a living will and all that stuff needed in case you go into a coma? When my uncle had a deadly stroke (taking almost a full year for his end of life) my mom and I, as disinrerested parties in the finances, ended up being legal witnesses to things my aunt had to sign to be able to make financial decisions such as selling the house, changing the banking arrangements, etc. (My uncle was my mom's brother and we had no doubts as to my aunt's motives.)
A few years ago my mom had a very bad fall and had residual brain injury. My siblings OK'ed my handling her finances and affairs. What an overwhelming job! But we also had to get power of attorney paperwork and as a family had to make medical decisions. But we all knew, very clearly, my mom's wishes. It's been a few years, she is now in a nursing home and has regained some of her abilities but still has a blank 6 months period where I had to take over all her affairs. She has never been the same and is no longer able to make decisions requireing more than one short mental step. My siblings also felt certain of my motives and fortunately no one questioned any of the decisions I made. But I was certain to outline them very clearly, with my recommendation and ask for agreement or dissent on all the big decisions. It's been fine. but not all families operate that way.
It is REALLY hard to get your parents to pause and consider these vital things. It requires that they face their mortality and consider the possibility of a disabling condition. If you know of anyone going through a dilemma like this (it happens to "young" people all the time) use the discussion to bring up the topic of planning and getting your affairs in order. My neighbor died of cancer at age 37 with 4 kids under the age of 12 - she knw she was dying and would never see her little one reach his 1st birthday. She began to plan only when she heard her doctor tell her to get her things in order. You can bet everyone on our block got their affairs in order then... so sad.
Good luck with your parents. between my husband and I we've handled the affairs of both of our father's deaths and gotten our moms into nursing homes - and had many, many medical decisions to make along the way. Life in your late 40's and 50's can be filled with really tough decisions - so thankful we've matured and learned lessons by the time we got to those times. yikes.
And BTW - you are not responsible for your mother's financial debts. So do't concern yoruself with that. Once she's gone her debts die with her. Debtors can go after the estate if there's anything such as a house. But unless the debt is huge they don't go after the house. They write if off as a loss. Good luck mama!