I would still move her to a different room. If the cages were right next to each other it might be a little too late, but it never hurts to be safe.
You can use a dimmer for the time being, you will just need to monitor it.Ok when i get home today i will put my female in a different room and start the quarantine process. I put them in the same room because they share the same thermostat. The female is a tub with a UTH and im scared that if i just plug the UTH in the wall with no thermostat that it will get too hot.