What is the point of moving equipment while she is already in the air? If China was serious about backing its warning with force, the landing ships would've been loaded and in the water before she even left for Taiwan. Now that it wrote a check it can't cash, Even if they decided to do something after the visit it would be too late. Having social media videos of tanks leisurely driving along Chinese beaches will do nothing to stop her from landing in Taiwan.
How would it be too late? It doesn’t matter if she lands. Did you expect Taiwan to be invaded and subdued in the couple of hours while she was/is en route?
Only important things are interception and attempted waiving off of the flight… and then the response after/if she lands or is blown up.
Better to try and intercept the flight without firing, and then if she does land, let her get to cover and then initiate Dongfeng time. It’s better she isn’t directly attacked and unharmed, but with reunification as the result.