“this was a holiday invented by florists and the greeting card industry “
This is incorrect. The idea came from Ann Jarvis and Julia Ward Howe, I think independently, shortly after the Civil War. Howe is better known as the author of the lyrics of the famous Civil War song, “The Battle Hymn of the Republic”. (Surprisingly given the Christological references in the lyrics, Howe was a Unitarian.) They were both social activists who hoped that a holiday would help improve the status of women.
Both Jarvis and Howe were deceased by the time the official Mother’s Day proclamation was issued by Woodrow Wilson, but Jarvis daughter Anna Jarvis, who had campaigned for the holiday, spent the rest of her life campaigning against the commercialization of the holiday by the greeting card industry.