T.S.
You can actually have a "proxy" stand in for your aunts at the Baptism. The actual Godparents would still need to do the Godparent preparation at their home parish and send verification to the parish doing the Baptism. They would be her official Godparents (on the certificate and in Church records), the proxy would just stand up with you at the ceremony.
We almost had to do this with my son because his Godparents lived out of town and we didn't know if they'd be able to make it. In the end, my best friend DID make it to the ceremony, so she was there and no proxy was needed.
Call the baptism coordinator at your new church. They'll help you out with all of this.
HTH
T.