They can boycott her as her marriage is not valid if it was against the approval of her father.

THE DAUGHTER OF MY SISTER RAN AWAY AND MARRIED WITHOUT PERMISSION FROM HER PARENTS. NOW MY SISTER AND BROTHER IN LAW ARE NOT MEETING SHE AND HER HUSBAND. CAN THEY BOYCOT HER IN ISLAM.

Invalid Marriages | April 17, 2017 3:34 am
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I did nikah without her mehram to avoid zina soo is marriage valid or not? because i got to know that if u think u will commit zina and u do nikah without mehram its all valid.
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Please elaborate with reference from Quran or sunah,about a must for wali to be present even for a woman marrying second time.it is said every sheikh has his own fatwa