In 2006, Jenkins was selected as Plaid Cymru's lead candidate for the South West Wales Regional list and was duly elected in the subsequent elections of May 2007. Jenkins was initially Plaid Cymru's Child Poverty and Culture Spokesperson for the Plaid Cymru group at the National Assembly, and sat on the Communities and Culture committee, Audit committee, and the newly formed Petitions Committee. In 2012, Jenkins was appointed Plaid's spokesperson for Heritage, Welsh language and Sport. She is chairperson for the Assembly's Cross Party Eating Disorder Group, and formed a new cross party group on human rights. Jenkins has been an outspoken Republican. Alongside her Plaid Cymru colleague, Leanne Wood, she is a member of the group Republic. In 2018, she married and announced she would be changing her surname to Sayed for both personal and professional purposes.
Controversies
During her first year as a Senedd Member she claimed over £10,000 in expenses including spending £750 per month on a second home in Cardiff after claiming it would be ‘impossible’ for her to do her job without it. AMs representing South Wales were later barred from claiming a second home allowance, but were permitted to claim up to 20 nights in Cardiff hotels provided they were working the next morning. In 2013 Jenkins was later criticised for claiming a nights stay in a Cardiff hotel after attending a Rihanna concert. Jenkins later repaid the money claimed. In June 2012, Jenkins became embroiled in a row about her comments on social networking siteTwitter, in light of the meeting between Northern Ireland's Deputy First MinisterMartin McGuinness and Queen Elizabeth II at a charity reception. After Welsh Labour members highlighted the comments, Jenkins said that she was appalled at being accused of "trying to destabilise" the peace process, and that she was giving up Twitter for the time being. Early in the hours of Sunday 14 October 2012, Jenkins was arrested by South Wales Police in Llandaff, Cardiff for driving erratically. When tested, she was more than twice the legal limit, but was released on police bail without a charge for drink driving. Jenkins subsequently issued a statement, stating that there were "no excuses" for what she had done, and that she had resigned her position as Plaid's spokeswoman on heritage, the Welsh language and sport. Her statement also stated that she had been receiving professional medical help for depression. On Monday 15 October, Jenkins was suspended from the Plaid group of AMs "while the process of justice takes its course". On 12 November 2012, Jenkins was charged with drunk driving, and on 19 December was banned from driving for 20 months.