Tax fraud?

my birth mother claimed me as a dependent on her taxes for 2018 even though I have not spoken to her/seen her/lived with her since I was 15. My dad has primary custody of me and she has not paid a dime for any of my education, expenses, ANYTHING in the past four years. I am 19 now but was 18 at the end of last... show more my birth mother claimed me as a dependent on her taxes for 2018 even though I have not spoken to her/seen her/lived with her since I was 15. My dad has primary custody of me and she has not paid a dime for any of my education, expenses, ANYTHING in the past four years. I am 19 now but was 18 at the end of last year and am now trying to apply for in state residency as I have moved from MI to NY for almost a year now and this tax issue is hindering that process. Is what she did illegal?
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