Your link is a bit different, she was in Chinatown to show people that not all Chinese people have the virus. Seems there businesses were stagnating due to xenophobia. She was wrong to encourage people to go out and shop in general but she was not wrong to try to stop the rumors surrounding Chinese Americans.
Not sure what that has to do with denial of the severity of the virus. Not to mention NYT just published a report confirming that the virus strain in the US mostly came from European sources, instead of Asian ones. Are you equating "avoiding Chinatown" with "preventing the spread of the virus"? That sounds extremely worrisome, to be polite.
That was on February 24th, a full week before there was a single case in NYC. Promoting local commerce before the virus reached that area seems pretty far from denying the level of risk presented by COVID-19 on a global scale.
https://www.youtube.com/watch?v=eFCzoXhNM6c
Also, we should be careful about how much we eviscerate people on both sides politically during this time. If our leaders are too afraid of repercussions to make difficult decisions, they may make bad decisions instead.
I'm calling for moratorium on partisan finger-pointing. I think we're all in this together, and that's the only way we're getting out of it.