Like Sue, I loved the story. It adds meat/backstory to the original story you wrote and added dimension to Sister Mary Frances. Cool that Mike put in an appearance, I assume he frequently helps by letting the Mother Superior know when/where the Sister is needed.
One of the great things about Fan Fiction is the lack of a 42/43 minute limitation to tell a story. You have taken one small scene in Lois and Clark and have made a full fledged character from it and integrated that character into Lois and Clark's lives as I suspect sometime in the future Clark will tell Lois about the Sister/Mother Superior which since Mary Frances seemed to know Lois should be an interesting exchange between the two.
Thanks for writing this.
Mike