How to deal with an older woman in the workplace?

I work with this older woman in the workplace who is in her 50s. I barely ever paid attention to this woman but I learned she has grew some hatred for me. She’s made a smart comment to a male colleague about me and also is a smartass to me if we are in a group. I don’t pay attention to her or look her way but if I’m talking to someone else who’s around she will add her two cents in like a smart ass like she’s trying to make me look foolish. I already act like she doesn’t exist and actually forget she exist sometimes but everything I do trigger her.

How to deal with an older woman in the workplace?
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