I don't think that Vicky was the source, because Electrek was also leaked delivery numbers:
Indeed, deliveries turned out to be even crazier: 83,500.
In Q3 2017 they made almost as many cars as they delivered - so this wasn't just a lucky guess I believe.
Vicky as a paint shop manager would not have any access to delivery numbers: that comes from the sales division, and is only summed up at the top.
I also don't think she had any motivation to be a long time Electrek source: she did break her NDA by leaking a few nuggets, but her goal appeared to be to basically proudly brag about paint shop progress. The Electrek leaker methodically leaked production numbers during most of 2018 (including Q4), with deliberate timing, which to me gave the impression of someone trying to "manage" market expectations.
So I don't think Vicky was the source, I think Electrek had a source at much higher levels than the paint shop. Which source went completely silent in Q1. (So far at least.)
I also didn't see any recent Alpha Hat figures: maybe Tesla plugged that leak too by talking to their mobile provider?
I.e. there's an almost unprecedented lack of leaks of Tesla Q1 production numbers, which might increase volatility when the Q1 production & deliveries report is released on the 2nd of April.