DD caught covid end Sept (followed by rest of family). We’ve LFT’d a few times since before meeting others etc and while the rest of us have been clear, she’s consistently shown a faint positive. I’m sure she doesn’t have COVID as no symptoms and couldn’t last that long but we’re past 90 days now, she’s back to school this week, and still getting a faint positive. Has anyone else had this and should I be doing anything about it (eg PCR).