16 year old Tax Code - untaxed Savings

Hi, My daughter is 16 and started her first job. Her Tax code is 1220L instead of 1250L and its says £326 untaxed interest on Savings? which has reduced her tax code, but I dont understand where this has come from or why? I need to peak to HMRC but I suspect it may prove difficult as they wont talk to me, but at 16 she doesnt know what to say/ask. Anyone know why her tax code has been reduced? Thanks

Hi,
Unfortunately, it is not possible to check individual tax records through this forum, if you have a question which relates to your personal tax situation or tax code please contact our Income Tax team:  
Income Tax: general enquiries
On this page you will also see a link to the personal tax account which may be the quickest way to review information relating to pay and tax history, tax codes and how to change them. 
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Thank you.