You must be watching a different programme to me.
I'm no May fan at all, but she did well on what was a ridiculous line of questioning. Whether May was for or against Brexit is really neither here nor there now. She has been charged with (and is likely to still be charged with) leading the Brexit process. Any leader of the country, Corbyn included, would have to do the same.
No, she is doing extremely well, now. Confident and assured.