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I've done a little research on this for you. According to this article from CNN, http://money.cnn.com/2006/01/24/news/companies/disney_pixar_deal/ Disney issued 2.3 shares of Disney Stock for each share of Pixar stock owned by shareholders. The fact the Disney bought out Pixar does not affect your basis in the stock. Your basis is the value of the stock as of the date of your mother's death, which you mentioned was $14.56. Therefore, your basis is 14.56 for each 2.3 shares of Disney stock that you sold.
I hope this helps shed some light on this for you. Should you need additional information,please feel free to reply.