... If she wasn’t a saint when she died, she won’t become one after death.
There are three steps to sainthood -- being pronounced, vernerable, blessed and saint.
It involves time and study. Please read the following links for more info.
SAINTHOOD 101: Rules for Becoming a Saint [Catholic Caucus] The Process of Becoming a Saint (Canonization) [Catholic Caucus] Pope Lists Criteria for Causes of Canonization