Negative result

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I tested positive over a week ago, a very clear came up straight away positive test. I'm still testing positive but very faint now. DP tested positive the same day, faint but came up in 10 mins and is now testing negative.
DD tested the day we did and was negative despite having a little cough. She's now coughing like she smokes 40 a day (she's 12, she definitely doesn't!). I've done two LFTs on her today and she's still negative. Is this accurate? How can this be accurate? She's had the worst cough of all of us.

Plenty of people never tested positive on LFT but were positive on PCR when they were a thing.
It could just be a false negative given that you are both positive and she has symptoms.

She'll likely test positive tomorrow.

I'm pretty sure I'm on day 10 of having Covid but didn't have a positive test until day 6.

I tested neg all last week but had the sorest throat ever, shallow breathing, fatigue, headache - the whole shebang. Pretty certain it was Covid.

If you tested her today and previously tested her over a week ago, she could have been positive in the interim (eg the day after her negative test) and is now negative again. Kids seem to stay positive for shorter than adults IME.