I only had one DD to deal with. Yes, there's a lot of drama with girls. I can only imagine having two around me during their teenage years. The best thing to do is get to a "zen" place in your head and tune them out. Do NOT get dragged into their dramas or choose sides (unless one of them is truly out there). Let them work it out. You will have a headache and your nerves will be shot, but that's teenage girls for you.
My second child is a boy. Oh, so much nicer!