xbox farm

Im trying to play Stardew valley on co-op with my girlfriend but whenever she invites me or I click join, it takes ages to connect then says "connection failed", we have tried everything -both have closed the game -both have turned the Xbox off -both have uninstalled and reinstalled the game -I...

I have a coop split screen farm on my xbox but it disappeared. Is there a way to restore it? I worked hard on it ):