Since you know this author here’s a suggestion that perhaps she can pass on to the subject which approaches the problem raising theological questions which may ease family tensions.
http://www.theusmat.com/islamandfreewill.htm
Time to recruit some ex-muslims and give the ole’ “Leah Remini” treatment to islam.
I have friends in Egypt who converted from Muslim to Christian.
Even in Egypt, that is not something done lightly.
Many of their neighbors if they were aware, would simply kill them.
The average Muslim does not pretend to listen to theological arguments.