<human>: My coworker, Beth and I have been working together for about 4 years as a team. Recently our department was given the go-ahead to finally fill a part-time position that's been vacant for several years and I thought it was great because it would lighten our work load a bit and we'd have another person to answer the phones. 

Anyways, they hired this lady, Karen a couple months ago and she seems nice enough so far. She has been a couple minutes late a few times but other than that I don't see any issues. Beth even commented that her work was good and that Karen pays good attention to detail. Despite her good work though, Beth has been finding every opportunity to nit-pick and criticize Karen and tattling. Every time Karen is late by so much as a minute, Beth writes it down and tells on her.  She never includes her when we order lunch out (which we do pretty frequently) and she's very curt and frankly rude to her much of the time. 

Beth and I have done very well as a team and we're good friends as well as coworkers so I don't want to rock the boat but I don't think that the way she's treating Karen is right but I also don't want to be a tattler and take it to our boss.  Anytime it's just Beth and I in the office, she's constantly ragging on Karen for just the smallest things.

 I don't want to make it awkward but I don't feel the way she's treating Karen is right or fair. I know how nervous I was when I first started the job, it can be a bit overwhelming. Karen already has enough on her plate with learning everything, she shouldn't have to worry about mean coworkers. I don't want to tattle on Beth but I do want to talk to her about it or something.

Can you summarize the given text in a few sentences?
<bot>: Coworker/friend is not being nice to new coworker, I think she's being unreasonable and being a bully.