She is headed for a disaster of epic proportions. I can’t stress enough what a bad decision she is making. It would be one thing if he were just a secular Middle Eastern fella (still not a great choice). But a practicing Muslim - she’s crazy.
Teach her about Islam, FAST. Explain honor killings and beheaded wives, female genital mutilation, the whole nine.
Christians should be equally yoked in marriage, but they should definitely NOT marry Muslims.
You have to be willing to lose her friendship in order to save her. Tell her the 100% unvarnished truth. Treat her like a sick alcoholic.
Still, your friend may just be one of those females that seemingly has an unconscious death wish.
Demand she answer if this is what she wants for her future daughters.