Your friend should have been claiming Tax Relief on her contributions either via her Self Assessment Returns, or claimed on her behalf by the pension company receiving her contributions who should re-invest the refund into her fund.
She should be allowed to take up to 25% of her fund free of tax:
https://www.gov.uk/tax-on-pension/tax-free
If she still has the same Financial Advisor, who could possibly be receiving a small fee from the pension provider, they should advise her on what the position is and what course of action she should take to maximise her return, including any retrospective claim from HMRC.