Albert Barnes Commentary John 11:27

"She saith unto him, Yea, Lord: I have believed that thou art the Christ, the Son of God, [even] he that cometh into the world." — John 11:27 (ASV)

Yes, Lord. This was a noble confession. It showed her full confidence in him as the Messiah, and her full belief that all that he said was true. See Matthew 16:16.