LGBT: Did I do the right thing?

At that particular time, her peace was more important. I have a feeling anything you said was a "little white lie" and isn't going to affect anyone at all. Other than grandma at the time. The elderly deserve respect, deserve to be happy, and it is said to see them so disoriented and agitated. If a little fib helps calm her down and makes her happy, I feel you did the right thing.