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.
You can have your friend go to this site: http://www.orthodoxyinamerica.org/sr2_0_0/locator.php
She 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.