Mary might have been a descendant of Judah but she was not religiously what they call Jewish today.  She might be biologically Jewish but did not practice the modern Jewish religion that falsely claims to be older than Christianity.

Descendants of Judah are descendants of Israel who is also called Jacob

Palestinians have a higher biological percent ancestry from Israel than Ashkenazi and Sephardic so called Jews

Jesus was not an Ashkenazi Jew or a Sephardic Jew he would be biologically closer to a Palestinian having a higher percent ancestry from Israel than Ashkenazi and Sephardic so called Jews do