MG can be transmitted through eggs. Before repopulating, get bloodwork done on your silkie. I recommend ordering birds from a reputable hatchery in the future. I wish you the best.
MG = CULL. Disinfect everything, lime the soil and wait a few months before repopulating. I know MG lasts 3 days in the environment but since there are other issues, it would be best to wait awhile before repopulating. Then I recommend ordering chicks from a reputable hatchery.