Hi again Jacob, setting my theoretical statement (in bold above) aside for a minute, if your Aunt claims to be a Christian, but she believes that others can be saved by believing in "their" god instead of Jesus, chances are very good that she is not saved, because if she truly understood the way of salvation through Christ alone (and 'why' He is the only way), then she would not say that there are other ways to "go to heaven".
So, you might want to ask her some questions about the Christian faith and about salvation to see where she's at, to see if she is truly saved or not. True Christians can become confused (or deceived) sometimes, but chances are very good that she does not know Jesus.
~Deut
p.s. - she's not Roman Catholic, is she?