I we are seeing someone who realises she has backed herself into a corner - she’s been exposed, she has nowhere to hide, and she is incapable of backing down so she’s just going to keep on attacking - she doesn’t know how to do anything else.
She’s been caught out and exposed to the whole world as a liar but she will never ever admit that, even to herself, so all she can do is keep attacking. It’s all she knows how to do.
As much as I despise liars and so despise what she’s done - I do worry for her after this. She is destroyed, mentally and career wise, and who knows what support she will have after this, if friends will stand by her or walk away. She needs professional help for sure but she’ll never accept it because that would mean admitting what she’s done. And that ultimately, she has done this to herself by her own actions and behaviour.