Give no emotional ammunition to this person. If she offers constructive criticism, take it professionally regardless of how it was delivered to you, say OK thanks for your feedback I will work on that, and work on it. In my view, they hired you because they saw that you had something to offer the unit. None of us are perfect and the new grad learning curve is a very steep curve, I have less than a years experience and I started in med-surg so I know! Our unit's nickname in the hospital was the 7th level of hell and no one wanted to float there.
I always think to myself, well (nasty mean coworker) if you are so awesome, then my new-grad fumbling shouldnt hamper you at all, you should be able to ace your shift no matter if I am slow as a mule.
What I observed to be important to my managers was 1. are you providing safe patient care and keeping patients safe 2. are you showing progress and improvement, not that you have to be super nurse, but are you advancing 3. are PATIENTS complaining about you. If you feel like some area of your care is unsafe, work on that ASAP. Otherwise just keep your head down and give this person enough rope to hang herself, so to speak. No manager wants to lose a safe nurse who has good patient rapport, even if they are slow at first. I do my best, practice safe, give the best care I can, help other nurses as much as I can, be a true team player, if someone decide not to "like" me...That person is free to go complain to the boss and they will either look dumb for whining about nothing or the boss will address their concerns with me.
chances are that person will end up making themselves look stupid to management. Often management will say, OK so they are struggling what are you doing to help this new person
Managers want the unit to run smooth. They dont want unnecessary turnover and they dont want tenured staff running off new staff that they just went to the trouble of hiring and orienting. This makes them look bad.
I was blessed with awesome co-workers when I was on my own out of orientation but there was one night shift nurse I hated to give report to. She rolled her eyes at me, picked me apart, tried to find everything wrong that I did. She had been a nurse for at least 15 years. I had been on the floor 6 months. I just smiled and said "thanks so much for your tips and advice I always learn a lot from you". Cheerfully ignoring the nasty overtones was what enabled me to subvert this unprofessional nurse. She gave up when I kept being positive...she got no emotional reward for trying to elicit distress from me! I flattered her and I even meant some of it. She never liked me but she stopped being such a witch.
Killing with kindness is a real thing. Play the long game with your chin up and you will win!.....best of luck to you!