Help through Medicare available? California

Mom is 91, dementia, wheelchair bound. Her living expenses are 1600 a month. She gets $2200 through social security and VA combined.

VA won't help for in-home care and I was told since she is house bound- that disqualified her under Medicare and she doesn't qualify for IHSS either because her income is too high.

Is there truly no help for the lowest mid-income elderly?