Albert Barnes Commentary Matthew 15:28

"Then Jesus answered and said unto her, O woman, great is thy faith: be it done unto thee even as thou wilt. And her daughter was healed from that hour." — Matthew 15:28 (ASV)

Great is thy faith. That is, your trust, confidence. The word here also seems to include the humility and perseverance manifested in her persistent request. The daughter was healed then. Going home, she found her well and composed (Mark 7:30).

"Be it" (Psalms 145:19).