becc,
If your plans work out as stated here you would be going through recruitment in the fall of 2013. Membership is by mutual choice. The good news is a NPC chapter, Alpha Gamma Delta, will be returning to the row in time for recruitment. In addition to the other chapters Alpha Gamma Delta will be recolonizing and taking a large number of women in all classes. This will be an opportunity for women to consider a chapter which will be returning and selecting members after formal rush has ended.
Before going through recruitment it is recommended you have a frank discussion with your parents/guardians about the expenses involved in membership.
Also, have an open mind. Chapters do take juniors, but there are far more freshmen in the new member classes. A helpful website is:
GreekChat.com. The site has forums for all NPC chapters, photos, explanations of the process and information about national philanthropies.