can the bank according to canadian law enforce its security and collect the debt? Show the analysis according to canadian law

A loan was made to a customer by the Royal Bank. The bank took possession of some share certificates from the customer as security. A year later, the loan was consolidated with some other debts owed by the customer. During the intervening year, the market value of the shares held by the bank had significantly dropped in value. Shortly after the consolidation, the customer died. Within a few weeks of the customer's death, his widow was asked to come to the bank, where she was asked to sign a promissory note transferring the husband's indebtedness to her. The shares held by the bank were transferred to her name and the bank continued to hold them. The value of the shares continued to plummet and the bank put pressure on her to provide additional security. She eventually handed over her title documents to a summer property. When the bank sought to enforce its security, the client defended, saying that she had been exploited by the bank