isolation=no roomates and everyone who enters (unfortunately including family and visitors) has to be masked, gowned and gloved. thats the way my hospital does it. and if i leave my room, which is frowned upon but sometimes you gotta get out, i have to be gowned, gloved and masked.
i would definitely talk to the doctor and strongly question this arrangement. you don't want your daughter to catch something from her roomate or vice versa. its for their own protection and its called isolation for a reason