During a heart attack, the spasms of the heart may cause the papillary
muscles to tear. Since the papillary
muscles attach directly to the heart valve, this often causes the heart valve to tear as well".
Would need more information about a "tear" such as the location, symtoms, what tests, etc.to evaluate for seriousness, treatment and provide a meaning.
Thanks for the question, and sorry to hear of your mother's condition.