Ikrimah (may Allah have mercy on him) said: Allah Almighty commanded forgoing and permitted it. If the woman forgoes, her forgoing is valid; and if she is reluctant and her guardian forgoes, his forgoing is valid.
(b) The first view is more correct: "or the one in whose hand is the marriage tie forgoes it" [Surah al-Baqarah: 237].
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14460