She has the right to end the marriage

She has the right to end the marriage

Ibn Qayyim  رحمه الله said:

أن الرجل إذا اشترط لزوجه أن لا يتزوج عليها لزمه الوفاء بالشرط، ومتى تزوج عليها فلها الفسخ

“If it was made a condition (during the ‘aqd) that the man not marry another, then he must abide by that. Once he does marry someone else, she has the right to end the marriage.”

"Fiqh As-Sunnah"2/10