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Bless her hope she’s okay she will be off balance for a while but they should grown back within a few weeks it can take 1-12 months for them to come back she will be able to fly but badly for a while the tail feathers on a cockatiels are like back stabilisers on a plane just keep a close eye on her while out to make sure she’s safe at all times till she’s is able to grown the feathers back
Hope this helps good luck