aging parents

The time has come for me to help care for my mother. She was sick for three days in the hospital and is now not able to be by herself. she is staying at my sister's house. My sister and her husband are retired, so are the most logical choice for a place for mama to be at the present time. My husband and I are still working and we are raising our 5 year old grand daughter. We plan to get a room ready for mama for the week ends to give my sister a break. My mama has lost a good bit of her short term memory or logic or something. She had been acutely ill with an altered mental status that they are still not sure of the cause. She is better each day, but not back to baseline. and I think she is realizing it now. I hope she does not deteriorate any more than this and just ups and dies one night in her sleep. Which is what she would prefer too. She is almost 90, only 6 weeks or so to go. I hope she makes it.