How can I tell my co-worker I hate her?

She can be very rude and has been rude to me so many times since I've been working with her. Lots of my co-workers find her rude. She thinks she can do whatever she wants because she's been with the company for so many years. She often takes much longer breaks than she's supposed to and the managers... show more She can be very rude and has been rude to me so many times since I've been working with her. Lots of my co-workers find her rude. She thinks she can do whatever she wants because she's been with the company for so many years. She often takes much longer breaks than she's supposed to and the managers look the other way. Recently I covered her "30 minute" lunch break and she was gone for an hour. The manager realized it and just shook her head and said to me, "This is ridiculous!" Then did nothing. If anyone else is gone one extra minute from a break they get yelled at. I wish I could just tell her how much I hate her, but then she might just kill me.
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