Anyone watch the series 'The replacement'.......
It was a 3 part drama, where the 'newbie' arrives, all smiley, helpful, and friendly.......quickly gaining favor with the whole team - bar 1!
To this team member, she starts by undermining her, picking fault in little things at first, slowly chipping away at her confidence, until she starts to feel really insecure.
Eventually the 'newbie', has manipulated the team to such an extent, they all love her, and think she's great! She becomes all powerful, whilst the other woman's life begins to un-ravel!
I have worked with such a person...and it was very unpleasant at the time.
She would be kind and complimentary whilst in the company of others - her 'audience'... but when no one was around, she would make cruel, snide comment's - the put downs.....
I was much younger then, and eventually left, before my confidence was completely shot.
I suspect the person you are working with is possibly jealous/envious of your position within the salon.....
Stay strong, and keep focused on keeping your clients happy!