[3] She studied at the University of St Andrews, graduating with an undergraduate Master of Arts (MA Hons) degree in 1986.
[4] She was a Non-Stipendiary Minister at St Saviour, Guildford, from 2007 to 2010, then Vicar of Wonersh from 2010 to 2019 and also Area Dean of Cranleigh from 2015 to 2019.
[7] In April 2019, it was announced that Sellin would be the next Bishop of Southampton; she legally took up her role on 3 July 2019, the day of her consecration [8][9][10] by Justin Welby, Archbishop of Canterbury, at St Paul's Cathedral.
[12] The "stepping back" was later extended[13] and on 16 July Dakin announced that he would retire in February 2022; meanwhile, Sellin continued as acting diocesan bishop.
[14] On 11 January 2022 the Archbishop of Canterbury announced that Sellin would continue as acting diocesan bishop during the vacancy following Dakin's formal retirement on 6 February 2022.