Ending up with a GA/GTA after admissions?

[Authorization]

I understand that my program takes applications for GA and Graduate Teaching Assistant positions along with the admissions application, so I submitted a resume and the required checklist form for a departmental assistantship application . I talked to the advisor and apparently the deadline/season for Graduate Assistant applications had already passed in the Fall. Since the application for a GA position was part of the application, I'm not sure whether I should ask her if future appointments are available for students who are already enrolled? (I'm probably going to brave the question anyway) I am aware that the International Studies program of which my graduate major is part occasionally has openings for teaching assistant positions (and I do make sure to keep up with announcements through the campus blackboard system as well as the official Facebook page). 

[fuzzylogician]

I'd ask. What have you got to lose?

[Authorization]

Thank you! I will! 

[kateausten]

Definitely ask.  I got an assistantship after I was already enrolled, so it is possible!  I started in a Spring semester so they weren't looking for new TAs at the time, but I spoke to the people involved in hiring TAs and was chosen for the next year.