John Gill Commentary 1 Samuel 1:18

"And she said, Let thy handmaid find favor in thy sight. So the woman went her way, and did eat; and her countenance was no more [sad]." — 1 Samuel 1:18 (ASV)

And she said, let your handmaid find grace in your sight
She had found favour in his sight she perceives, and she desires it might be continued and increased; and that as he has prayed for her, he would still use his interest at the throne of grace for her:

so the woman went her way ;
took her leave of Eli, and went from the tabernacle to her husband: and did eat; what remained of the peace offerings, which were to be eaten that night, and not left till the morning; and though she would not eat her dinner, her heart was so full of grief, yet she could now make a good supper, being eased and relieved in her mind:

and her countenance was no more sad ;
sorrowful and dejected, but cheerful, brisk, and lively; believing that her prayers, and those of the high priest, would be answered.