What to do when your colleague is too competitive with you?

In brief, I just have a student job at the reception desk and my co-worker is super competitive to the point where it gets absurd.
Like when each have assigned tasks she tries to do my tasks as well. If I am supposed to answer the phone and take appointments and she to enter new data, she also wants to show off and answer the phone the moment it rings so I won t take it. In an 8 hour shift, she doesn't want to take a break not even for lunch.
And the most funny of it all, I am the one who trained her cause our superior was abroad and I have been a year working in this office when she s only been a semester. Now she feels entitled to tell me how to do stuff I myself thought her and am knowledgeable about.
What's her point? And how to deal with her?
What to do when your colleague is too competitive with you?
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