Firstly, ensure that both of you are using the same version of the game and have the latest updates installed. Sometimes, discrepancies in game versions can cause such problems.
Secondly, check if your wife's in-game settings are configured correctly. Make sure she hasn't disabled the option to see chest names accidentally.
If the issue persists, consider restarting the game or the Xbox console to see if it resolves the problem.
If none of the above steps work, it's possible that there might be a bug or glitch in the game's multiplayer functionality. In that case, you can try reaching out to the game's support team or community forums to report the issue and seek further assistance.