I wonder if your mother may have meant this programme:
http://www.babybumblebee.com/I_landings/Austim_PDD.cfmMy daughter is not classically autistic, but is experiencing some difficult to define developmental disorder with a lot of very similar symptoms and challenges.
I had a sample DVD of the above programme and she got bored of it because of its extremely slow pace, so I never explored it any further. (Interestingly, YBCR although not designed to increase the vocabulary of an autistic child, was a great success and she did pick some new words from it as well as learned how to read them.)
Waterdreamer will be the best person to give you advice on this topic as she also, if I am not mistaken, lives in Canada. Your cousin’s daughter may be entitled to ABA therapy, which is the state-of-the-art therapy for autism.
As there is not much state support where I live (whether you have a diagnosis or not), I am trying to DIY-teach my daughter some skills myself based on ABA principles (I can's afford private help). I am using this resource:
www.rethinkautism.comwhich is great, although not free. It is, however, cheaper that hiring private help. I am aware that some families use it while waiting for their child to be placed into an ABA programme, since it is so important to start early.