I am so sorry to her about your sister. There are several things to try.
SSDI: Social SEcurity Disability Insurance
Medical is part of SSDI
GO TO www.ssa.gov
FOR MORE INFO
SDI: State Disability Insurance
STD: Short Term Disability (provided by employer)
LTD: Long Term Disability (provided by employer)
Must have requested STD first
Welfare: She can sign up for Medicare here as well
I hope these suggestions help you and your sister. Take care.