As far as we know, she's single.
I could potentially see her going back in for a couple days/a week, for a twist of some sort.... IF they got their chequebook out (little point in her doing Love Island again for free, as there are other dating shows that would pay her, which she has turned down before). I'd be surprised if she went back as a full-time contestant.
Still, Maura has been suspiciously quiet on instagram recently, even for her. She hasn't posted a pic/reel since Dec 31st...and I think the last time she posted a story was well over a week ago (although she has been commenting on/liking others posts).
Interestingly....Maura's agent, Talia, is currently in Cape Town, South Africa. She had been there with Karen Hauer (from Strictly, who is also her client) for a tv ad (so I didn't think much of it), but I noticed that while Karen has returned home, Talia is still there
....of course she might just be overseeing the finishing touches to the ad. Could be pure coincidence.