How can I find assisted living for my mother-in-law that does not exceed her monthly income?

I have looked at a lot of assisted living places, and all of them charge in excess of my mother in law's limited monthly income. I have no way of making up the difference. Although she is eligible for the VA benefit, this approval time takes up to a year. It is getting to a crisis point where she needs more care than can be provided at home but I haven't found anywhere that falls within her income per month. I need to know if there is anything or any avenue out there that will allow my mother in law to get assisted living care that does not exceed her monthly income. Do I press the social worker for a solution? I am starting to worry quite a bit about it.