[10] Dinenage stood as the Conservative candidate in Portsmouth South at the 2005 general election, coming second with 33.5% of the vote behind the incumbent Liberal Democrat MP Mike Hancock.

[12][13] Dinenage worked with local partners to secure Enterprise Zone status for the Daedalus disused military airfield at Lee-on-the-Solent in August 2011.

[16] Dinenage has campaigned for local road improvements in 2013,[17][18] helping in May 2019 to secure £25.7m Government funding for the Stubbington Bypass, which has now been completed.

[24] Dinenage's appointment was welcomed by learning disabilities charity Hft, who had campaigned for the restoration of the Minister of State role.

[28] In November 2019, she introduced plans for making learning disability and autism training mandatory for all Health and Social Care professionals.

[42] She has made a parachute jump and abseiled off Portsmouth's Spinnaker Tower[43] to raise funds for the MS Society.

A patron of Conservatives against Fox Hunting,[44] she was named one of Queen guitarist and animal welfare campaigner Brian May's Heroes of 2010.