You are NOT a bad kitty mom! We went through all kinds of heck with Sammy when he was a youngster. He tore me to shreds all the time! I realize now that I was his toy and all of his playful aggression came out on me. I finally got to the point that I had to watch him at all times. He would sit on the kitchen table watching my back while I was doing dishes and plotting his attack! I was covered in nasty scratches and bites all the time. People at work thought I was being abused ( I was but not by my hubby )
He did settle as he got older. I have never had that problem with any of my other cats but also none of them came in alone. They all had siblings or other young cats to play with. I don't think that all "only kittens" act this way but some are just more energy loaded than others and must find a way to vent it. The attack on your dad, from under the sheet, is a common occurance around here. Most of the time it's the game of hide and seek...ahah! I got ya!...game. If it is at all possible spend lots of playtime with her using a big stuffed animal or stuffed sock. Tickle her belly with it and let her bite, scratch, and back bunny feet the thing to death! Do that a couple of times a day and let her get that playful energy out.

I promise she will get better. If you try playing with her and toys that she can attack I really think she will get better and you two can have fun together while she kills the toy and not you! I hope this helps.
Good Luck