Hello I am a licensed attorney here to help you with your question, please review my response and do not hesitate to ask for clarification
This is a common issue, do you feel your race, gender, age or any other protected civil right is the reason for her treatment of you?
What you may want to consider at this point is to send a letter to the employer, stating that you wish to work with her as a team, and that you want the matter settled,
by doing this the employer may believe that you are cooperative and may try to mediate the matter,
in terms of an investigation, they will see if any misconduct was happening, and if they do not find anything wrong, they may either warn both of you, or make arrangements to put each of you in different teams, or terminate you or the other,
It is hard to know what an employer will do, so it is your best course of action to try to cooperate fully now, and be proactive and give the employer options, other than a termination
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