Ostentatiously good, a female performer with no regrets (4)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

A semi-&lit. I doubt Édith could ever be described as PI, ostentatiously good, but definitely A F[emale]. Mistress of the rolled R, best known for “Non, je ne regrette rien”. Manage your own translation.