All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
It is obligatory for your wife to leave this job as long as she is obliged to uncover her head. Therefore, you should clarify this to her and order her to leave this job, and she is obliged to obey you.
As regards what she has earned from this job, then if the work itself is permissible, then there is nothing wrong in benefitting from it, and you can benefit from what she has given you as gifts or other money, because the salary is for doing permissible services at work and not for unveiling her hair and the like. However, she must quit that job now, as we have already stated.
If she finds any other job, she is obliged to cover her body, i.e. she must avoid unveiling her hair and avoid wearing indecent clothes, and avoid being in seclusion with men, speaking in a soft attractive voice with them, and other things that a woman is not permitted to do.
Allah knows best.