why not pose the question to the USDA which provides the benefits. the SNAP benefits question is not related to income tax.
https://www.fns.usda.gov/snap/supplemental-nutrition-assistance-program
since it is your mother
and
since her income is less than $4300
and
assuming what you provide is over 1/2 of her total support support
you qualify to claim her as a dependent. the law does not require claiming a dependent for tax purposes
here's a worksheet from the IRS you can use to determine if you provide over 1/2 of her support
https://apps.irs.gov/app/vita/content/globalmedia/teacher/worksheet_for_determining_support_4012.pdf
