Must one travel to join her husband abroad and start a new chapter with him, or should she insist on his return to resolve their disputes, even if that leads to divorce?

What is happening between your husband and your family is from the whispers of Satan. Allah has commanded reconciliation, and discord shaves off religion. Obedience to the husband is a religious duty, and it takes precedence over obedience to parents when there is a conflict, because his obedience is more emphasized. It is obligatory for the wife to obey her husband in traveling with him, unless her travel is without a mahram. If a mahram is unavailable, some scholars have permitted travel with a safe companionship.