IMHO, this looks like the mods are "mobbing" Mel, and are jealous because her trip reports are so popular.
Yes, in other trip reports of her, the off-topic comments were getting a little too numerous (is that an English word?), but it in this one????

After each (frequent) installment of Mel, there were a couple of people that said they liked the episode, and there were a couple of them that gave a remark or asked a question about something they read. And because of that the thread gets locked??
Not even a warning on this thread and some days to behave well again (although I don't think anyone behaved bad)?
As someone else said, this smells like favouritism and censorship, and it's a start to get ashamed you're a member of the DIS.
There are so many trip reports where the writer goed off topic. Way off topic. And nothing gets done about those, not even a remark.
Mel writes
ONE paragraph about a most horrible trauma her daughter had to live through as a small child, and how that influenced her and how a Disney vacation can make her happy again, and the thread gets locked??
In that case, you also have to lock Zzub's thread. Because his whole post-trip report thing has nothing to do with a WDW-vacation either. And I am oh so sure many other threads are like that too.
But no, only Mel's thread gets locked.
It seems to me, the webmaster should re-assess the need for adequate mods for the trip report boards.