By "BA Psych" program I'm assuming you're referring to the non-honours psych degree? That program is very different from PNB because it doesn't include the courses that we are required to take in 2nd year, which are closed to those outside of PNB. This makes it difficult to transfer in from other programs.
I don't really know what the specific solution is for your problem, but your best bet would be to speak to Ann Hollingshead in the psych department. Her contact information can be found
here.