Either search out the truth, reading the bible from cover to cover and compare that to the book of Mormon,
look up historical facts away from the LDS to see if the pro-christians are right
The first WON'T work, for there is hardly ANYTHING in the BoM that is NOT 'biblical',
and THAT is why Headquarters in SLC want you to 'pray' about it - NOT the OTHER writings
where the DOCTRINES of MORMONism are REALLY found!!
The second won't work because she already KNOWS that the Christians are right.
This is a SPIRITUAL battle and WILL be won there!