Well, yes. As far as I'm aware, the EU has to receive the revocation of Art. 50 from the Government. They would be forced to ignore anything Parliament sends them. I don't want to disagree with you, but the few interviews that I can manage to watch every day all display politicians not getting the EU. They still kept talking about renegotiations yesterday. Not May and her cronies, but MPs from both sides of the aisle. I'm not convinced that they actually understand the automatism that is in place and that the EU is actually, literally done with this. Did you see that interview I refered to, where they interviewed two MEPs? Consternation was on their faces, they couldn't quite understand why British MPs are still talking about negotiations... the debate should be rather simple, really: 1. No deal, 2. This (bad) deal or 3. No Brexit. That's it. May steering the debate away from the issue at hand and making it about how she behaves is damaging the little influence Parliament still has... at least from an EU perspective.
Edit: Also, indecisiveness is the worst quality in leaders. This is why. First she picks the wrong direction and doubles down on it, then she's uncertain about what to do with it once she gets to the point where it begins to hurt. Instead of ripping the bandaid off like a big girl, she drags it out... what a torture.