My best friends has been getting upset about this girl that sits at the lunch table with her (she has no choice than to sit at the table with her, there assigned by classes). Well this girl has been doing some really mean stuff to her.
-Yesterday my friend had her 'lady supplies' in her lunch box then this girl (ill call her AK) took it out and showed it to everybody.
-Today they were sitting at the table and there was a puddle of root beer on the table and AK fliked it in her face.
My best friends has been really upset about this, but doesent want to tell the teachers. I really have no clue what to say to her to help her. I would appricate some advice on this topic, please help!

I would say to alert a teacher. This girl is a bully. And the reason that she continues to do it is because she knows that it bothers your friend. Tell her to ignore EVERYTHING that girl does or says. If the girl realizes her efforts to be a pest are in vain and don't bother your friend, she is likely to stop. In my opinion and experience, girls in igh school and middle school are mean to each other because they feel they are competition within the social scene, and are jealous. Or they are trying to look tough by picking on the "weak one". Girls are mean. Let me know how things go.

No one likes a tattle tale, but no one likes a bully either. I would alert a teacher to keep an eye on the situation. Maybe you could go to a teacher, tell her the situation and give specifics of what is going on, and also tell this teacher that your friend is too afraid to say anything due to retaliation. However, if a teacher was to be aware of a possible situation and was on the lookout (kind of walking by at just the right time or looking from afar), maybe this would put a halt to it and get the bully in trouble without anyone else really being involved. No one has to know how the teacher was told about this. Teachers really do understand more than you think. Remember, they were your age at one time.