I find it interesting to note that a husband is allowed to annul his wife’s vow of nezirus on the grounds that he doesn’t want a bald wife.
If HKBH takes such a view that he’ll allow a husband to overrule a wife’s neder (which is otherwise an issur d’oreisah) with regard to such matters, surely He’ll overlook it if the OP doesn’t want to shave her head because it will cause shalom bayis problems in her home.
The Wolf