Heres my analysis.
She observed the oncoming traffic and thought she could nip through without waiting!
This is why she cut the corner
She took a chance certainly. but under "normal" circumstances the 4 second or so gap would have been sufficient to make the turn,(especially from a "Rolling start") albeit with very little safety margin !
Unfortunately it wasn't a 4 second gap because the bike was doing 100MPH! it was only a 2 second gap.
(The biker also made the classic error of turning into the danger, which didn't help! one should generally try to pass behind the obstructing vehicle rather than in-front of it)
She was certainly careless in that even at normal speeds she would have been cutting it a bit fine (In the US I beleive it would be teermed "Failure to yield")
But I wouldn't find her guilty of anything more than that. The Bikers own contribution was his own responsibility, not hers!
No she didn't have time, even if he was doing the correct speed, she didn't have time so that's rubbish. You are massively overestimating it. It wasn't close to 4 seconds different. It's roughly 1.3 seconds, which as I said would move the Clio roughly 2meters forward. It's 3.7m long car, so still not even close to making the turn safely.