Personally, if I thought a snake was hungry and I was troubleshooting behavior, I would offer a meal to see how the snake reacts. I'd use the info gained from the snake's reaction to better fine tune my ongoing care.
Overfeeding (and underfeeding) is a chronic condition, and I wouldn't recommend either. Adding another meal (or skipping one) isn't a problem except in those rare cases where it causes a regurgitation (meals back to back can do this). I think in this case the knowledge you could gain from offering a meal would be valuable.