Yes, the beating was bad, I don't think we're seeing the full story. Do you guys honestly think a parent will just out of the blue he just decides to beat her, there isn't even alcohol or drugs involved. I'll tell you what usually is the case. Little brat thinks she knows everything there is to know, and wants to do exactly as she pleases. Parents explain that that's not the case, and she must adhere to the rules of the house. Brat thinks that the parents know nothing, then does exactly as she pleases, and in turn causes a tone of grief not just for the family, but all the relations.
I highly doubt this is just a one time thing that little miss brat has done. More like a punishment that got out of hand when all else has failed. The sad thing is other little shits that want to ignore pesky things like "rules," "ethics," and "morals" will now view this story and think they can threaten to call the cops if they don't get their way, and don't get to do whatever they feel like.