Can I just add that I actually do apologise if my comments have caused you further stress. I do stand by the comments, I think you have unrealistic expectations of feedback, (in this particular instance), and I do not believe that a confirmation of an email is will make everything okay for you.
That said, I don't get pleasure at all from thinking that my comments may have upset somebody, so I genuinely do apologise if they have. You can always ignore them, as I'm sure you will, considering your disagreement with them. But you did ask...

Oh sorry, I've misunderstood. Your evident stress is because you don't know if she's 'received' your email and it makes no difference to you whether she's actually read it or not?!!!!

'I'm sat around twiddling my thumbs right now when I'd much rather be working'...So how does 'just knowing' whether she's received an email or not make to you being able to work?

I reiterate my point, you really need to take resposibility, if you want to work, get on with it.

Hey Ho.

Seriously, you think that this is your supervisor's fault? Can I assume that your MA dissertation draft is approx 12,000 words? And that you sent a draft and expected a reply, and constructive comments, within two days?
'I know for a fact that she sits at her desk, every day' - are you hoping for yourself a career in academia? If so you really need to alter your perception that supervisors are able to 'sit at a desk all day' and, literally, be able to respond to your requests immediately.
I do actually apologise if I sound harsh, it's just I genuinely can't believe the extent of your upset, considering it's only been a couple of days. I think rather you need to admit that if you required a reply by this weekend, you should really have sent it in with more notice.
Good luck with the feedback, but really, either chill, or submit your work in advance of requirng feedback. And no, I'm not on the other side of the fence, I'm post-MA, pre-PHD.
Thanks.