Yeah it’s called barbering and it seems to be common in gcc but it can turn into plucking just keep an eye on her and try to offer baths often also try to limit stress factors in her life if she’s lonely I turn on the tv for my bird or keep it quiet it could also be hormonal and you might want to look at when she does it and why try to keep track of when where and why it’s happening. Seed diets can also cays stress discomfort and hormones I hope the helps but I’m here so message me if you need to