Her heart is not in Mordred's destruction of Camelot, but unfortunately she's written herself in a corner where she has to write it, as in the Merlin trilogy she firmly established a) Merlin's prophecy that Mordred would destroy Arthur, and b) Merlin's infallibility as a prophet.

I mean, that just makes it all the more tragic— like, something something prophesy that is technically true, but blames the butterfly who flaps its wing for the hurricane's destruction, and a Fate that's so grimly inevitable that neither Arthur's most desperate attempts (I assume this series covers the May Babies episode?) nor Mordred's best intentions can prevent it from happening...?