Can't make her appear by clicking any Animons (checked all of them) and she doesn't appear after re-assigning her either. I don't know about levels, this happened after unlocking her lv. 20 lock. That screenshot was her at lv. 25. Restarting the game, the save, etc. didn't help either. I haven't gotten back to that point in my other save so I'll reply to this if I end up finding a work-around or if it doesn't repeat with a different save file.