The "obvious reason" that @SmoggyLambGG 's Sim won't use the ERAM is that she is Very Angry. Sims often refuse to do things when they are in bad moods.
@Snazzalitous If you are having the same problem, the solution is to fix your Sim's bad mood. A Cold Shower or Chamomile tea will help with Anger. I frequently play spellcasters, so I would drink a Potion of Emotional Stability. You could also use the Moodlet Solver potion from the Rewards Store or any of the emotional potions if you don't mind spending some reward points. There are lots of other methods as well, those are just some of the easiest.