Mr Turner said S4C had made progress implementing the changes recommended in his report.
BBC: Staff views 'challenging' for S4C after external review
She also appeared on the Welsh-language channel S4C's 'Diva's' Concert conducted by Owain Arwel Hughes.
They also urged the government to actively seek to safeguard the future of S4C.
The S4C Authority has announced that its chairman, John Walter Jones, has resigned with immediate effect.
The S4C Authority took effective control of the channel after its chief executive quit.
Earlier, Tory MPs said they believed members of the S4C Authority are "part of the problem".
From April 2013, the majority of S4C's funding will be from the licence fee.
But he said concerns remained, including the prospect of further budget cuts by S4C.
S4C rejected the complaint and said the programme included a variety of viewpoints.
She said that S4C had "played a key role in the campaign to save the Welsh language".
Channel bosses took advice from Welsh broadcaster S4C on catering for an audience which speaks a minority language.
S4C cuts could endanger the relationship between Welsh and non-Welsh speakers, the Heritage Minister has told BBC Wales.
Mr Jones has written to Culture Secretary Jeremy Hunt to emphasise the importance of S4C and the language.
Afterwards, Bethan Williams, chair of the Welsh Language Society, thanked Evans for her support over the S4C campaign.
Mr Garlick said he was also concerned about the prospect of the BBC Trust withholding funds from S4C.
The agreement states that "S4C shall retain its editorial and managerial independence from the BBC at all times".
It safeguarded the statutory minimum 520 hours of programmes supplied by BBC Cymru Wales to S4C each year.
Huw Jones, chair of the S4C Authority, said some of the messages given in the report were "challenging ones".
BBC: Staff views 'challenging' for S4C after external review
The UK government asked S4C to model what would happen to its services under cutbacks of 25% and 40%.
Which has led to intense speculation that it's Ian Jones, formerly of S4C, but now working in New York.
It took some persuading, but her government agreed to the creation of S4C.
He is explained that he is currently awaiting the response of the BBC, S4C and Ofcom to the broadcast.
Dywedodd Mr Deakin fod clybiau a'r cyfryngau, yn benodol S4C, sy'n darlledu gemau'r uwch gynghrair, erioed wedi derbyn y syniad.
"There has now been an agreement between the S4C and the BBC although it is not entirely satisfactory, " she said.
Iestyn Garlick, chairman of the Welsh independent producers organisation TAC, said they welcomed assurances about S4C's editorial and managerial independence.
The BBC Trust and S4C Authority have drawn up a plan to ensure the editorial and managerial independence of S4C.
He said the Welsh government was waiting for responses from the BBC - which produces the soap - S4C and the regulator Ofcom.
Mr Thomas said believed DCMS decided to ignore the legal advice "and were pressuring S4C to acquiesce to the reduction".
To celebrate the birthday, several special programmes will be shown in Welsh and English on S4C and BBC Wales between 11-17 October.
BBC: The show's cast enjoying a birthday tipple in the Deri Arms
Mr Deakin said that clubs and the media - particularly S4C, which broadcasts premier league matches - had never accepted the idea.
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