Perhaps she doesn't know of these places because they are pretty far from her (she lives in East Boston, almost to Revere, and doesn't own a car).
Speaking of Orthodox places in Brookline, I thought of doing a retreat for a weekend at Holy Transfiguration monastery sometime soon. Someone I met recommended it highly. I used to work only several blocks from it.
Lubeltri,
You can have your friend go to this site:
http://www.orthodoxyinamerica.org/sr2_0_0/locator.phpShe can type in a city and state name to see what Orthodox Churches are close to her. There may be Orthodox churches in other jurisdictions in her area which have active young adult groups.
sincerely, Tamara