<ol>
<li><p>Has she been reinstated?</p>

<p>No, she has not been reinstated.  To Monica's credit, she is holding her ground.  Whether she is ever reinstated or not remains to be seen.  Given how long this has been drawn out already, I think it's fair to say that SE is ashamed to lose face.  If they do reinstate Monica, it will likely be because of a court order.</p></li>
<li><p>Was there a reason why she was removed or was it just a glitch?</p>

<p>There is no better source than from the horse's mouth, so to speak.  Monica gave a lengthy interview with Tyler from <a href="https://www.youtube.com/watch?v=tFiQPkdb5Qs&amp;t=116s" rel="nofollow noreferrer">"Tyler's Tech" Youtube channel</a> in which she describes the circumstances, timeline, and backstory to this saga.  As I understand from her own words, a question was asked in a moderator lounge - a genuine <em>question</em>. It spiralled out of control and out of context very fast from there.  But I encourage you to watch the interview for more details.</p></li>
<li><p>Why have so many users including those with very high reputation gotten on the bandwagon? </p>

<p>For some, it is a matter of principle.  For others, especially to those who knew Monica, it is a matter of camaraderie and solidarity.  And for others still, it is a case of "sticking it to the big bad corp." when they have clearly abused their authority, dishonored a star employee/moderator, broken their own code of conduct, and failed to make amends when warranted (and many more reasons...)</p></li>
<li><p>If I want to go along, how do I change my avatar?</p>

<p>Simply click this link: <a href="https://meta.stackexchange.com/users/edit/current">https://meta.stackexchange.com/users/edit/current</a> and edit as required.</p></li>
</ol>
