It should also have been noted that Trumpty has used the C word himself. At least three times when he was overheard; probably many more we don't know about.
A journalist on Chris Hayes tonight said Bee was using the word to turn a misogynist insult against Trump and others for whom it's a "normal" insult. And it wasn't the first time she'd done that on the show. In the past, no one objected.
That said, however, this was not the moment. She could have just called Ivanka a "feckless bitch". It would have worked.