During the 2010-2015 parliament, she served as Parliamentary Under-Secretary at the Department of Health, then, as a result of a ministerial reshuffle in September 2012, Milton was appointed a Government Whip (Lord Commissioner of HM Treasury), Vice-Chamberlain of the Household and later Treasurer of the Household. She abstained on the parliamentary vote on the legalisation of same sex marriage in February 2013 citing a lack of consensus amongst her constituents. In March 2015, she was appointed to the Privy Council of the United Kingdom and therefore granted the title The Right Honourable. She voted for the United Kingdom to remain with the European Union (EU) in the June 2016 membership referendum. Milton was re-elected as MP for Guildford in the 2017 snap general election. After the election, she was selected as the Minister of State for Skills and Apprenticeships and the Minister for Women.