Naomi had no family in Moab, and no one else to help her. The return to Judah. The three widows head back to Judah. Naomi could have stayed in Moab all of her life wishing things were different, but she did something to receive what God had to give her. By all common sense, this was the wise thing to do.
Deal kindly is the Hebrew word hesed .
Hesed encompasses deeds of mercy performed by a more powerful party for the benefit of the weaker one. The Lord grant that you may find rest, each in the house of her husband . God has intended that your marriage be a place, and source, of rest, peace, and refreshment in your life. Naomi is saying that she has no other sons to give either Orpah or Ruth. She felt that the calamity which came upon her family came because they were disobedient, probably in leaving the Promised Land of Israel and marrying their sons to Moabite women.