John Gill Commentary John 11:28

"And when she had said this, she went away, and called Mary her sister secretly, saying, The Teacher is her, and calleth thee." — John 11:28 (ASV)

And when she had so said
Had expressed her faith in Christ in such terms, as the apostles themselves did, (Matthew 16:16) (John 1:49) (6:69) .

She went her way ;
from Christ, being ordered by him to go to her sister Mary, and fetch her to him:

and called Mary her sister secretly ;
either beckoned her to come to her, or whispered her in the ear privately, as Nonnus paraphrases it, that the Jews, who were enemies to Christ, might not hear:

saying, the master is come ;
near the town; is not a great way off: she might use the phrase, "the master", for greater privacy, that should she be overheard, it would not be who she meant; and because it was an usual appellation by which Christ was called in that family, and by which he was well known; and was expressive of honour to him, and subjection in them as his disciples:

and calleth for thee ;
to come to him; Christ asked after her, desired to see her, and ordered her to come to him; which was an instance of his respect for her.