DiscoDancer1975
It sounds like jealousy to me. You may never have spoken, but she’s built something up in her mind, and dislikes you for it.
You need to break that if you can, and confront her. Just keep in your mind, that she is most likely struggling more than you are.
Good luck
And the original poster has built something up in her mind, too. She and this colleague have never spoken, but she thinks hat she dislikes her and is "nasty and ignorant".
It is high time that you did speak to each other. She could be thinking that you don't like her , and that you are nasty and stand-offish for avoiding her whenever you can and not speaking to her when you can't help meeting.
No need to become bosom pals and exchange life histories, just smile and say "Hello" when your paths cross, and "Pass the milk, please" if you meet when making a cup of coffee. You may find that she is very nice, and if she isn't, you are not committed to doing any more than that.