I've never been in ME but I gather that it's as thick and nasty as Oregon/Washington's Cascade range. You could get lost really easy in most of it. I wouldn't even think about going out without a compass and GPS.
I don't know how thick it is where she got lost but in eastern Maine you can't see more than 10-20 feet, if that, because it's so thick. If you drive the road up towards Machias it's pretty unbelievable, at least for a westerner.
