en_tn_lite_do_not_use/mat/15/22.md

a Canaanite woman came out from that region

"a woman who was from that region and who belonged to the group of people called Canaanites came."

Have mercy on me

"Have mercy and heal my daughter"

Son of David

"Son of David" is a title for the Messiah, and the woman may have been calling Jesus by this title.

My daughter is severely demon-possessed

"A demon is controlling my daughter terribly" or "A demon is tormenting my daughter severely"