Mom (90) lives in a reduced income apartment in the town she has lived in all her life. We sold her home. What do we do next?

We sold her home, with her involvement about 4 years ago. She has heart problems. A pacemaker and has had a ‘silent heart attack’. There are 6 siblings. We share her care, financially and other wise. Recently, she is becoming agitated and obsessive over small things. She is already on an anti depressant at a fairly high dose. She doesn’t like to drink water or keep her fluids in good shape. I guess I would say it’s just slow decline. Mom insists on being totally independent financially although she knows she isn’t. She worries over money we kids spend on food and basic household items. Her doctor told her recently she must walk everyday to continue to live on her own and as her ankles were swollen and she is often ‘light headed’. So I guess I don’t know what to do next.