Put yourself in Her shoes.
You are married to an NBA-Allstar and he's about to get the biggest contract of his life.
You would, 100% know about the Boston Celtics, probably even know their color/mascot/logo. You would be extremely aware of the situation.
If you were part of Gordon's family... even his extended family (uncles/cousins), you would certainly be his biggest fan, and you would be very aware about Brad Stevens/Celtics/Pending Free Agency.
There is zero doubt in my mind that this was an accident.
In fact, you would have to be extremely naive to believe this was an accident in my opinion.