Because of course they did. That is the point of her running.
Republican-tied group spends $1.5 million to promote Green Party's Jill Stein in Wisconsin...
https://www.usatoday.com/story/news/politics/elections/2024/11/01/gop-tied-group-spends-1-5-million-backing-green-partys-jill-stein/75946571007/?gnt-cfr=1&gca-cat=p