Rather than do a roundabout and give everyone whiplash (lol), Rey won't be disappearing; instead she is just randomly gaining visions/memories of her time here before thanks to the Force. Feel free to say she was kind of MIA-ish for a couple of days. She'll be rushing to visit Jac right away before letting everyone else know her memories came back. I would like to say this all happened before the ~dramatics because, you know.
I skimmed through the tag to check on any interactions with the last Rey, but I am also happy to handwave some "offscreen" shenanigans over the past few months or so, too!