Chelsea Blackwell, aged 26 of Harris Drive, Bootle, Liverpool, has been charged in relation to an incident which took place between 12 July and 6 August last year at HM Youth Offenders Institute in Aylesbury.
Following an investigation by Thames Valley Police, a prison officer has been charged with misconduct in public office in Aylesbury.
The incident involved an allegation of letters and telephone contact being made to a serving inmate at the prison.
Chelsea Blackwell was arrested on 6 August 2016 and was charged on Tuesday (21/2).
She will appear at High Wycombe Magistrates' Court on 24 March.