How to talk back to someone who is undermining you?

I have a girl on the same managerial level as me in a workplace. she is always trying to undermine me (i have had people point out that they believe she may be acting this way as she is jealous of me). She is not a trustworthy person so i feel like i have to step on egg shells around her.
I have worked at this venue for a long time, so work and my social life have combined.

I am at a loss of how to handle myself, how to talk back. I always come out looking like an idiot as she is able to handle herself on the spot better than myself. Any advice?
How to talk back to someone who is undermining you?
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