By participating in the discussion, she is unduly influencing a decision that will affect her directly.
I fail to see the logic behind this. For starters, as proven by DeepSpace/Mitchell's statement, the topic would have been treated the same had Lauda not dealt with it. Secondly, I don't see how moving a topic will affect them at all. The topic was not removed from being seen, nor censored in any way. The difference being that it is categorized correctly, if anything making it easier for anyone interested to find the thread.
BTW the thread was complaining about the behavior of a staff member, and asking for that staff member to be removed from being staff, that sounds more like a thread for meta don't you think?
The thread was complaining about receiving negative trust from Lauda, for this reason it belongs in Reputation. This is the case regardless of who received or left the feedback. If the thread were about a problem with the trust system it's self, not a specific person on it, or complaining about Lauda's moderation (as this thread is, I suppose) then it would be more fitting in Meta.