Are you feeding her only scratch grains? Or is that a scratch and peck type of feed? Do you feed a balanced chicken feed, either layer feed or all flock feed? Scratch is not a complete feed and does not have what she needs. I wouldn’t give a molasses flush since she had a liquid poop. If you insist on giving it later, dosage is 1/2 ounce (15 ml or 1 tablespoonful) of molasses to 2 cups water. Allow her to drink that for 4 hours and change to plain clean water.