It can take up to about three weeks back in a hive for a boxed up queen to start laying again. Since she was boxed for 7 days that you know of, and who knows how many prior to that, her laying was halted almost like a swarm queen would be. So putting in a frame of young larva at this point would be the best idea. It will keep the workers honest and the population up. Give her three weeks total before you worry too much.