Neither the statement nor county spokesman Jeff Wilhite confirmed a cause of death.
Long was reelected as party chair April 15.
The statement referred to Long as "a happy warrior for family, for faith and for country."
Long, the statement added, "recruited, encouraged, championed and counselled so many of our most able community leaders. Rose restored our party's finances and championed the purchase of the first party headquarters we could call our own."
In addition to her husband, Long is survived by two sons, Brad and Brian, both of Springfield.
This story will be updated.
Contact Steven Spearie: 622-1788, sspearie@sj-r.com, twitter.com/@StevenSpearie.