QCan I add this follower to my hand with Maid Leader's On Evolve ability?

ANo. Although this follower has an ability that evolves it, it doesn't have an evolve ability.

QIf I evolve this follower with its Fanfare ability, can I evolve another follower using its evolve ability in the same turn?

AYes. Although you can only activate one evolve ability per turn, other abilities that evolve followers do not count towards this limit.