Hello there! Here to help clarify your question~
You can't find Lumera because she left DeviantART a few months ago, as well as many other social sites such as Discord, in order to focus purely on her college studies! She hasn't permanently left, however I am not sure when she will come back (I'm assuming she will when she has finished her degree/s). Not to worry, her username hasn't changed and I doubt it will, but her art won't be available to see until her account is re-activated.
Apologies for the late response! I hope this helps <3