Becky,
I am no 'Expert' on Banking systems but I feel confident in saying that IF you get your Mother a Debit Card issued by the SkotiaBank down here, she CAN withdraw dollars in Canada from your Dominican account. I also feel confident in saying that she will NOT be able to draw cash over the counter from your Bank of Nova Scotia account unless you have money in it in Canada!!! I doubt very much whether they (Canadian branch) will accept the fact that you have money in your Dominican SkotiaBank account & let your Mother draw against that!!! - Grahame.