Work

I still didn't recieve my raise yet, and no word. I wonder if there is light at the end of the tunnel. To make matters worse, we hired a new girl. I am VERY open to new staff but this girl rubs me the wrong way. She had experience, which is a plus but her demeanor drives me mad. I am a big threat to her, but she is already stepping over toes, making recommendations on things she knows nothing about. She even had the nerve to tell how something was done when I have been doing it for years. It took a lot for me not to back hand her because I am not that type of person. She has made many mistakes and I tactfully put her in her place. She does not get reprimanded for being late to work. She gets time off for appointments, leaves early when she can even thought there's work to do (she does this everyday), doesn't ask anyone else if they need help, and she's been late about four times in a two month time frame. We ended up letting a coworker go who had the same experience but was tardy to work all the time. So, now she is becoming the same way with a know it all attitude. I know we need the help around work, I get that, but why should she get away with it. I think that's why I'm heated.
I have been working Saturdays for the past 6 months to increase my income a little. She knows why I do, but she stepped in and asked to work my Saturday. Since this is a great opportunity for people to be trained and not all the same people are working Saturdays, my boss thought it was a good idea. I have never been so angry. I am not financially set for this. I am at a great disadvantage because I will be losing some overtime. She won't because she leaves early all the time. What can I do to not be so mad? She knows my situation and is really looking to outshine me. Am I jealous? No, but I need this job more than she does. I won't get into details but she can do without a job. Urggggghhhhhhhh!