Sophie Cunningham is breathing more life into her beef with Jacy Sheldon after the two were involved in a scuffle during a game back in June ... 'cause the Indiana Fever star autographed her nemesis' card -- and included a savage diss alongside it!!
The moment went down at a recent signing event ... when a fan presented a Sheldon card in front of Cunningham to sign. The hooper got a chuckle out of it before getting to work and etching "Property of Sophie Cunningham" on the item.