TV and Film industry & nics

Hi there,
I have a client who is a self employed as a camera operator, but during the year she has worked for someone under paye, she paid no tax as NT tax code was used, but she paid class one ni.
My question is, that as she has paid class 2 and class 4 ni in the normal way through self assessment. Is there a way to reclaim the class 1 ni, and has she overpaid in ni?
Thank you in advance
I have a client who is a self employed as a camera operator, but during the year she has worked for someone under paye, she paid no tax as NT tax code was used, but she paid class one ni.
My question is, that as she has paid class 2 and class 4 ni in the normal way through self assessment. Is there a way to reclaim the class 1 ni, and has she overpaid in ni?
Thank you in advance

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The .gov.uk guidance is quite vague but can be found here.