dealing with critical personalities

I recently started a new job. I am not a new nurse and have worked in a variety of settings. My preceptor for the past several weeks has been in the same job for many years, and thus is unaware of the variety of skills and disease processes outside of this speciality setting. Since she has been at this setting for so long she has made it clear that there is an "us" vs. "them" thing going on. She has a buddy that is her BFF and they must always be scheduled on the same days, sit together, and take lunches together. Some of that is not important, but when you take a lunch based on your buddy and not when is the best time based on patient care, then that is not good judgement. I sometimes feel so middle school when she does this whole BFF thing. I go to work to take care of the patients and pay my bills, not to make it out like a middle school BFF thing or gossip sessions. The "us" meaning older nurses that have been there many years, versus the new nurses that are young and just starting their careers. On my first week with her she would complain that she does not see how the young nurses are completing their work so fast and appearing to have more down time. For the record, I am in my 40's, and in-between the ages on the unit. I really don't fit into either category. The following weeks she has made comments regarding several staff members. These comments include they are lazy, not thorough, etc. She says all this about them and acts pleasant and cheerful to their face. I have also noticed her personality is one that demands to be the focus of attention and she wants to be the "super" nurse. She is one who wants to out nurse everyone and talk about it...laying claim to how much better she is and why...when in reality others are good too, but many just go about things differently. When I precepted with a few other nurses (including the "young" ones)....I realized that they are focused, do the charting at the bedside, and get a good game plan laid for the day. I picked up many tips from them that assist me in being more efficient with time. They do spend time with the patient but also multi task and complete things real time at the bedside...this is how they complete things quicker. When I attempt to incorporate things I learned from others while with her she seems annoyed and tries to set me up for failure just so she can say...see I told you my way is better. I am starting to get worn down by her constant critical comments and superior aura. I try to ignore her when she engages in conversations about others but can tell she wants me to nod and agree with her. I am just getting quite over the situation. I do not want any hard feelings toward her but need to focus on keeping things professional but it is just so difficult! I will be on my own soon and grateful for that. One other thing that bothers me is her constant talk about patients. Many of the patients are on the floor in excess of 30 days, so there is that bond that develops BUT in my opinion we still need to set boundaries and keep a certain professional distance. She gets too chummy with them and then discusses things with other nurses who have cared for them. Recently, she told me that one patient is famous in a certain sport and she confided in her young adult daughter that he is her patient. I just don't agree. How does one handle this? Should I tell the educator what is happening? How do I continue on when I am nearing my breaking point? Any tips would be gratefully accepted.

Thanks!