Short answer: Yes. It is totally possible to complete RN school with lupus.
Being a new grad with lupus is difficult, however, and required some major adjustments on my part. I actually started out in a hospital new grad program, working 12 hour night shifts, had a major lupus flare (though I did not know it at the time), ended up leaving that job, and later found successful work in LTC. I've been back in the hospital environment for over a year now and I do like it, but I would be lying if I said that it wasn't more difficult sometimes because I have lupus. I take a mix of DMARDs, prescription strength NSAIDs, and sleep much more on my days off. Being a nurse with lupus requires extra self-care and self-awareness, and a good rheumatologist in your corner, but it is doable.
If you already have a decent amount of nursing experience, consider snagging one of those lovely jobs in case management, clinic nursing, or with health insurance companies. Or go ahead and get your master's. I plan to do the same once my current contract is up.