I mean, technically, disabling youtube comments is a kind of localized censorship, just like telling a a Jehova's Witness to go away because you don't want to hear what they have to say is a kind of censorship. It's kind of silly to think disabling comments on your own video is an affront to free speech. People are free to make their own videos, write blog posts, email, shout from rooftops their responses to her videos. All of which I'm sure have been done.
Here's what she is censoring:
a) people who just want to troll.
b) people who want to troll her with female-centric inflammatory language (rape threats/wishes, etc)
c) people who do A and B with intent to silence her because she said stuff they disagree with
d) people who want to have an actual discussion who foolishly only use YouTube for that activity.
The irony of group C is delicious no matter how small it may or may not be.
That said, we do to tend to associate Youtube with being able to <more directly give feedback, so it does give a very slight (and irrational) sense that she is stifling discussion. I also don't think she wants to have a discussion with people even on her own side, but not because the comments section is disabled.