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Born in Neath, where her mother is from, Jenner moved to Anglesey aged two where she learned Welsh at school.
She studied English literature at Bangor University.
With bright, pink hair, she was more focused on singing in a "very punk, rocky type" band called The Mephs, short for Mephistophelean Engines of Pleasure.
It is not, one suspects, the sort of name dreamt up by someone planning a future career in Welsh politics. Indeed, she says politics was not something she was into then.
What changed that?
"My dad banging on about the European Union constantly," she said.
Her father, who's from Liverpool, had joined UKIP. Then Jenner saw Nigel Farage on television.
"It was seeing him, and then watching his YouTube clips in the European Parliament and everything: I've never seen anybody so animated," said Jenner.
"I felt he was really principled and I suddenly thought 'oh, I actually care about politics now'."
She became a fellow UKIP member and stood for Nigel Farage's next party, the Brexit Party at the 2019 UK general election.
Married with two children, Jenner describes herself as a "proud British person" but "first and foremost" a "very proud Welsh person".
Reform is by far the biggest opposition party Cardiff Bay has seen, albeit with its seat tally dropping to 33 after a defection to Plaid Cymru last week.
After a tumultuous week for Reform, Jenner's first job is damage limitation.
Her second, longer-term task, is convincing Welsh voters that Reform is more than Nigel Farage's party in Wales and has the makings of the next Welsh government.
