J.C.
Welcome to the beginning stages of "toddlerhood". Once they start moving, you're on the go all the time right along with them. There's nothing wrong with her standing at 6 months. My kids started pulling themselves up to stuff at around that age, my daughter could stand up with nothing to hold onto at 9 months and both of my kids walked at 10 months. As far as the crib thing, the only thing you can do is let her cry it out, unless you want to make a routine of going in her room to calm her down every night. After just a few nights, she'll lay right down for you. If you start going in there, she'll keep it up night after night until you come in. So, don't start the bad habit, just let her cry it out.