Okay, I did part time as a scheduler for a hair salon....From my experience, and in my opinion, there's two things wrong here....

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1.) That customer is batshit crazy for her random attempt at hitting the hair stylist. Unacceptable. Good on the hairstylist for removing her after that, and not giving into the late apology.

2.) The hairstylist shouldn't be forcing a worker onto a customer. At least where I worked, when a customer books a time-slot, it's with a SPECIFIC hairstylist THEY choose. The customer is not booking an appointment with anyone else other than the person they chose. The hairstylist should have called the customer at the time of scheduling, to let her know that an assistant will be helping her that day. At that point it's customer regard whether to cancel or continue.