Jamieson, Fausset and Brown on Judges 15:6

6. Who hath done this--The author of this outrage, and the cause that provoked such an extraordinary retaliation, soon became known; and the sufferers, enraged by the destruction of their crops, rushing with tumultuous fury to the house of Samson's wife, "burnt her and her father with fire." This was a remarkable retribution. To avoid this menace, she had betrayed her husband; and by that unprincipled conduct, eventually exposed herself to the horrid doom which, at the sacrifice of conjugal fidelity, she had sought to escape [Jud 14:15].