Are you sure you can't get any money of any of your family members? Even if your dad isn't on good terms with his brothers and/or sisters, surely he could still borrow $200 for the health of his wife? If not then you have an incredibly strange family...but I guess everyone is different
Have you asked around everywhere? Your mums work friends? Cousins? Grandparents? I find it hard to believe there is no one at all that can lend you the money to help your mum out.
If you don't get enough money soon, I'd honestly say begging on the street is worth a shot, if you are in the city or something, because some people will actually give you some money