I've recently been letting my budgie out of the cage to fly around. He's not very good at it and he has a tendency to smack into things. I expect him to get better at it over time, but most recently, I noticed he tore up his cere a little from flying into things.
I really hope it's not too serious. I heard the cere can peel some during a molting cycle, and he's got pin feathers on his head so I believe he's molting right now. I know ceres also heal naturally, but if this is beyond what natural healing will accomplish, I'd like to know.
As she is not used to flying you need to offer her a safe as possible area to practice flying and landing. Some great idea's are to use a mosquito net the type you hang over your bed to keep her enclosed and safe. Close all curtains hang some old sheets , cover mirrors. A small tent can be excellent for learning how to fly in . Also try to only let her out when it is a bright natural light , budgies do not have good night vision at all.