If you can find a better job someplace else do it, but don't quit the one you have now until you have a secure offer.
God lead this person to the right job for them, or teach them how to deal with your help on whatever comes their way. Sometimes when we are new the coworkers can be mean and the job unbearable, but if we persevere with
your help we can be successful, and before we know our coworkers become more compassionate toward us. Help this person to be strong and give them your peace. I pray in Your mighty name amen.