Lilys broken tail feather should be attended to. It is a blood feather & should be removed by a veterinary or someone that knows how to remove it & knows about the care of cockatiels. Birds that sit on a perch & grind their beaks are content. The crest rising is a sign of exceitment & something they naturally do. I have a hen cockatiel & have learned so much about birds in general from her. Birdsnways. com is a great place to go to. You can click onto Cockatiels & learn so much & ask all the questions you want because they have some great moderators & people on there that can share their knowledge.