Important question about cancer and healthcare. PLEASE HELP!

Ok, I know that this is off topic but I am at my wits end. I really need some advice and every one I talk to and every # I call tells me there's nothing tha they can do.

Out of the blue my mother found out in october of last year ('09) that she had STAGE 4 Ovarian Cancer. She was working at walmart at the time but could not afford medical insurance due to the fact that she is single, living on her own, and walmart doesn't pay crap. Anyway, she was put into the hospital, had surgery, and ended up having to leave her job. She applied for Social Security Disability and was aproved but was put on the standard 5 month waiting list. She she received Medicaid for the 5 months that she was waiting for her ssi disability to kick in. She was able to have a few chemo treatments and another surgery before the 5 months was over and the medicaid ran out. Once she started receiving disability they dropped her medicaid, but told her that she was eligible for medicare. The problem is that there is a standard 24 month waiting period from the time that you are deemed "disabled" until your medicare kicks in. Once Social Security dropped her medicaid she reapplied through the state. They denied her because they said that she was over the income limit. The only income that she receives is $900 Disability and she cannot afford health insurance. I added up her regular monthly bills yesterday and they are over $1300. My husband and I have had to take on some of her bills just so she will have money for things like groceries. How can medicaid think $900 is "too much money"!!!! I don't know what to do. She still has chemo treatments that she needs that are several thousand dollars apeice and not to mention prescritions. I called tons and tons of insurance companies and 90% of them would not even accept her because she had a pre existing condition. and the few thast would wanted more than she makes in a month and and OUTRAGEOUS deductible. I am out of ideas and am exhausted! She had fought so hard and come so far and is going to end up losing in the end anyway solely based on money????? What do people do in situations like this? I've talked to case worker after case worker and they tell us that there is nowhere else to turn. My mom is only 43 years old!!!! We live in Texas by the way, I know that state laws are different and different states have different programs. If any of you have any suggestions or any phone numbers to call, PLEASE let me know! Thanks for taking the time to read this cause it is very important to me and thanks in advance for any advice that you have.