What can I do to help my mother cover the cost of personal care home or assisted living?

I recently had to move my mother to an "Assisted Living Memory Care" facility. It's actually somewhere between a personal care home and skilled nursing facility. She only has SSI income and no assets, but the cost of the facility is higher than her income. She has medicare. Her bills are a medicare supplement and a dental bill, which makes her about $700 short each month to cover the facility. She doesn't qualify for medicaid because she is over the income limit by $190. She's not in good health (diabetic with multiple complications and under pain mgt care), but her doctors say she doesn't meet the criteria for a Skilled Nursing facility. Getting anyone on the phone at GA Medicaid is virtually impossible. She has QI medicaid, but should I and how do I get her on full medicaid? I thought it would help if she could drop the supplement and be covered by medicare and medicaid, but I am hitting bricks walls on that. Any thoughts? :)