I am so sorry that you have been put in this position OP, and sorry for your mum too.
Both my parents had strokes sadly. I will be BRUTALLY honest here so feel free not to read on!
Your mother absolutely will NOT do better in your home.
At 89 years of age (89!! That’s nearly 90!!) and post-stroke, realistically she probably does not have a lot of her life left (sorry).
Post-stroke she will be much more vulnerable physically, and at higher risk from colds, flu etc. Plus she will be at high risk of further strokes. As a minimum she is going to need someone available 24/7 either just to check on her (best case scenario) or to care for her fully (worst case scenario).
She may have continence issues. She will have mobility and cognitive issues even if the extent of these is not fully apparent yet. Her memory and speech will probably be affected in some way even if not apparent yet. She will be DIFFERENT in many ways and these will become apparent over time. The impacts of a stroke are felt over a lifetime. Your mum may be shorter-tempered, confused, scared, even violent at times.
She needs to live in a dedicated care facility where she will receive care from trained, qualified personnel with access to equipment (hoists, wheelchairs, physio equipment etc) and with adequate space, grab handles, alarm pulls, night time staff and all the other essential stuff and staff to help keep her comfortable and safe.
This is not a job for one woman.
How would you lift her if she fell? How are you going to function on little sleep? How are you going to retain your mother-daughter relationship with her if you are caring for her intimate needs 24/7? She could stumble or fall while you are physically supporting her and take you down with her, injuring both of you, and then where would you be?
Your mum needs to be in a care home / nursing home where you can visit her regularly, enjoy being mother and daughter, and cherish the remaining time you have together.
I wish you and your mum all the best; it is a horrible position to be in, but your family are being selfish and unsupportive in putting this all on you. Put your own oxygen mask on first! 