First of all your DD needs a diagnosis, indentification of what measures can be put in place to help her and then these measures need to be implemented (good luck with that one).
DS1 has "moderate dyspraxia and dyslexia", his last ed psych report puts his IQ well in excess of 140, he's highly articulate creative passionate exceptionally emphatic and super sensitive to others peoples emotions with a photographic memory for detail, but working memory is very poor, processing is diabolical, this makes his learning erratic at best, he has poor concentration at times although he's not disruptive. He has been completely misunderstood and basically underperformed all his school life. This is frustrating for us and even more so for him and at times he's struggled with MH problems.
I've learnt you cannot change him (this has taken me years to accept this), this is the way his brain is physically wired up, if he was missing a limb a leg or an arm you wouldnt expect him to grow another one, you would accept it and he you and he teaching staff would put measures in to help him adapt and build on his strengths and marvel at him if he ran a race and won or learnt to knit with one hand. Dyslexia dyspraxia ADHD are "invisible" but this doesn't mean they are not there. My advise is build on your DD's strengths, encourage her in every way to do what she loves, even if to all intense and purposes it seems to you and teachers to be an odd choice, this will work wonders for her mental health, and confidence, if possible remove from her life anything she struggles with that is not essential, or if say she's crap at say math for example aim low, we celebrated DS1's C at math GCSE (first attempt I now believe in miracles) in the same way most would celebrate an A*. If you can don't overwhelm her with subjects, DS had to do 12 GCSE's he couldn't organise that many, and struggled terribly but the school insisted, he did better in the 6 th form where he was at least studying one subject out of four subjects that he's interested in and now at uni he's doing even better because he's only studying that. You will have to accept that your DD will have good moments even moments of unexpected pure genius and very bad, one lesson will go well and the next won't, this is because she has worked 4 times harder than others to overcome her problems and is now physically and mentally exhausted. This doesn't seem a difficult concept to grasp IMO but most teachers struggle with this. Finally in my now very extensive experience most teachers (in both section sectors) are lazy couldn't care less less jobs worths, who have no more understanding and imagination of any child that's different from the norm than one of my cats, occasionally no I'm wrong very occasionally you'll meet a brilliant one (I'm talking 2-3 in 13 years of education) but most want a easy life, make no effort to understand your DC, are not prepared to adapt their approach in any shape or form, although some say they are, and moan constantly that your DC is underperforming. You as a parent are all you child has, you are her only advocate, you will have to stand up and try and get what help she needs, defend her when she's criticised and is understood, believe in her, fight her corner. Never assume anything is being done for your DC ( it's probably not) or that the help you managed to get put in place last term will still be there next term (it won't), so never take you eye off what's meant to be going on. My head still aches from 13 years of banging it against a wall stuffed with useless jobs worth lazy teachers who couldn't care less can't or won't read their own commissioned ed psych reports or implement its recommendations, I would have been struck off by my governing body if I as a professional behaved half as badly as this, and our resources (in the public sector) are stretched much more thinly than teachers are. Anything we achieved was due to us fighting tooth and nail for it. You'll have times when you will be enormously frustrated by your DD and loose you temper or think fuck it, I can't struggle with this any longer but stop for a second and imagine how they must feel. For those of you who think I'm exaggerating or my DS1's case is unfortuate or it's the schools he's attended etc trust me it's not I've spoken to 1000s both professionally and personally who sadly will tell you the same thing.
Good luck, trust me you're you going to need all the luck you can get.
