Unfortunately, you cannot bring your grandmother to the US with an I-130 (family-based petition) because she does not fit into any of the preference categories or qualify as an immediate relative. The best that I can think of for her to enter the US is with a medical visa, which is very similar to the tourist visa. You can learn more about the process here: www.uscis.gov.
This correspondence is intended as general information and not as legal advice. Please speak to an experienced immigration attorney for assistance.
I will agree with the previous lawyer. You will want to look into a humanitarian parole. Talk to a good lawyer to help.
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