Hi there,
I do sympathise with you on this one. Just because you may have bombed this one does not mean you will do badly on the next one etc. etc. Just examine your day leading up to the audition and promise yourself that whatever it was that had you off kilter this one time that you don't repeat it. This has happened to me in two auditions and since then I have been much better. Do not be too hard on yourself, and believe it or not your teacher, if she is worth her weight in gold will also understand.
I hope this helps.
Cheer! Keep your chin up! :-)
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