From East Brunswick she would have to take the 68/138 bus.
Here's the link to the bus schedule http://www.njtransit.com/pdf/bus/T1168.pdf
(scroll down a page for buses to NYC.)
I wouldn't recommend the 138 because it goes all the way to Port Authority (42nd and 8th). The 68 (first bus @ 6:11am) goes to Exchange Place in Jersey City, from there she can get on to the PATH train to the World Trade Center. And finally take the ' E' Train to Canal street (chinatown). I don't think she'll make it by 7am.
Your other Option is to drive her to the New Brunswick train station, take the Northeast Corridor Line (5:11am) to Penn Station New York(6:10) (not newark) then walk over to the A , C, or E train and take it downtown to Canal st.
Good Luck hope that helps.