Thanks for the replies, though I'd be lying if I said I wasn't a bit disappointed. I've been searching for answers about her breed and thought I'd found one when I discovered Basenji dogs.
She is definitely big for a Basenji–about 50 lbs--but I just assumed the other breeds in her would account for that.
Her wrinkly forehead and huge ears are what convinced me of the Basenji...
These photos (found through a google search for "basenji mix") in particular had me convinced:
(Second from the right could be her twin!)
As well as the information on this website:
http://basenji.20m.com/ReasonsNottoGet.htm Yes, it is a list of reasons not to get a Basenji, but it is also a list of issues we have with Jersey! Haha.
I've thought of Shiba Inu as well as Rhodesian Ridgeback, though I hadn't heard of this other Ridgeback type. The vet calls her a dingo as a joke… haha.
I guess I'll just have to settle for "mutt." Thanks a lot for everyone's input!