That said, let me temper that with some skepticism. First, having got a book deal[1] she is now in the position of directly financially benefiting from media promotion, which in my opinion puts her in a slightly different category than a purely objective scientist.
Second, while she is careful that her words are always defensible and rooted in science, my interpretation of her (prolific) memes is that hell yeah, she thinks it's a lab leak. I want to emphasize that this is my interpretation; at worst, she can be accused of communicating ambiguously enough to create this interpretation in a cross-section of her audience. And a large fraction of her replies are people who are, shall we say, less scientifically careful.
Third, she has truncated quotes from her detractors in a way that changes their meaning, and I find this not entirely good faith. Here's the thread[2] that has that quote and Dr. Rasmussen's response. Perhaps this is an honest difference in interpretation, and Dr. Rasmussen is being too thin-skinned about it.
In any case, my goal here is to present evidence which I think might be relevant, and encourage people to look at it and decide for themselves. As I say, while for the reasons I cited above, I certainly wouldn't consider everything Dr. Chan says to be gospel and accept it uncritically, I absolutely agree that hers is a voice that should be heard. Much to her credit, she has been consistently calling for a real investigation for a long time, well before it was newly fashionable.
On your second point, she has stated repeatedly and explicitly that her position is that she doesn't know what the origin of the virus is, natural origin is not ruled out either, and that all she is asking for is that both theories are credibly investigated, for example here [1]. Of course she talks a lot more about the lab leak, but that's largely because she feels this side has not been discussed sufficiently, which was certainly true until 2/3 months ago.
On your third point, you're right that she truncated the quote, but I think her interpretation is the one many readers would come to: "lab leak=conspiracy theory". The quote is dishonestly structured to start with, lumping together lab leak with 5G/Bill Gates silliness. It's the same mistake that the Andersen paper made lumping lab leak with bioweapon. I wouldn't count that as a win on either side.
[1] https://twitter.com/ayjchan/status/1411049136762327043?s=21
> Investigating the effects of human genetic variation on the efficacy of adeno-associated virus (AAV) variants in order to engineer gene therapy viral vectors targeting diverse patient populations.
So this is professional work at a prestigious institute on (a) viruses, (b) engineering of viruses, and (c) deeper understanding of the dynamics of transmission of these viruses in humans. Further, adenovirus is one that can be engineered to be combined with pieces of SARS-CoV-2 to do interesting things in humans, as I can personally attest, having had the J&J vaccine.
It's hard to imagine a set of credentials better suited to analyzing origins of Covid. There are a lot of grifters out there, "epistemological trespassers" if you will, but Dr. Chan's is a voice that deserves being listened to.
Full quote (as per Dr Rasmussen), and italic parts support the above interpretation:
> Unfortunately, this did little to quell often contradictory and sometimes outright ridiculous conspiracy theories that spread faster than the virus itself: SARS-CoV-2 was the result of a laboratory accident or was intentionally engineered, and this was concealed to hide either spectacular incompetence or a complex international conspiracy involving Bill Gates, the Chinese Communist Party and 5G wireless network infrastructure with an end goal of ushering in a new world order.
I won't even touch the rest, but this one still strikes me as too early to call, given the cultural importance of saving face. I'll buy that there was much less of it than people allow their imaginations to run away with it, but if you don't think there was some very long tense, sweating bullets meetings on how to best go about sculpting the narrative and shaping the story in terms of national interest goes, or covering of ass in the early days, then I don't think you've been paying attention to the diplomatic realities surrounding China at all.