So it seems to me there is not just a blanket "yes" or "no" answer to the question, "Does God hear the prayers of Muslims, even or especially when they are praying for the safety of a Christian?"
And yet MORE reason.
He knows when their intention is, "I am praying to the One God, the Creator of heaven and earth, of all things visible and invisible, Whoever He may be" --- and that is perfectly plausible even if they say "Allah," since Allah is merely the Arabic word of "God" --- Arabic-speaking Christians were using this word for God for 500+ years before Mohammad was even born. He also knows when their intention is, "I am praying to the 'god' who demands the slaughter of infidels."
You are AMAZING, Mrs. Don-o.
He will judge accordingly. With perfect fairness and perfect accuracy. So perfect, that when all things come to light, every good-hearted and fair-minded person on earth will be punching the air and cheering and saying, "He got that exactly right!"
All I can say is BRAVO!