She is not going to find what YOU are looking for.
But Montgomery County like DC is a place of diversity of locations. You can find very high end quiet neighborhoods right next to some of the poorest parts of town.
During my recent week spent in Columbia Heights showed exactly that. I saw quiet suburban neighborhoods that butted right up against the “bad neighborhoods”. I would not worry so much as to the neighborhood as I would look at the schooling and commuting constraints. Also having some diversity in the schools might be good for the children.
Definitely, schools should be #1 on the list.