I was in a similar position.
My former boss had his Japanese secretary, and then me. When I was hired, I was the English-speaking secretary. We had duplicate job functions, although in slightly different ways.
There was ALOT of friction, until I decided I had enough. I started projects proactively. I volunteered to help out other people. I went above and beyond my job title BIG TIME. My other co-workers really appreciated my help. My boss was impressed by my proactive-ness. I still did my normal admin duties, but because I was receiving a lot of praise for my own projects, I stopped caring about being recognized for my admin work.
Take what you do to another level. Do out-of-the-box thinking. Be creative, proactive. Don't lower yourself to X's level - instead, go above her.
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