I'm not sure if I'm doing this right...
So I've made a little test map. Don't mind the torn up teddybear, I just used it as a marker to know where to click. That event is a below character action button trigger, the contents just being "Change Level: [Annabelle], + 1" in attempts to test how this works.
The variable event I tried to follow you on was this:
(The second tab is just an empty default tab set to Self Switch A, and there's nothing in it.)
But when I try it out, the moment I open the game I get this:
That line at the bottom being some glitched version of the text box.
And when I click on the teddybear to level up, same thing happens: