If her priority date in in 2007, she has at least a 6 year wait for a visa number on the basis of a sibling petition (family 4th). She must maintain legal status on her own.
http://www.travel.state.gov/visa/bul...etin_5092.html
She really needs a work visa. If she doesn't, she will need to return home to wait because overstay is not forgiven for this type of petition. If she in in legal status in the US, she does not have to go for processing at the consulate, but her only legal status would be on the basis of work since she is no longer a student.
If she does not understand the process, she should first read the USCIS document on family based immigration. If she still does not understand, she should consult an attorney.