Once You have had the full info from your dd,I would be tempted to write to the school and complain about it as a safeguarding issue, asking about the safeguarding review they did beforehand, particularly with regard to female students (because obviously when making a change like this that has so many obviously negative effects they did a safeguarding assessment right?!?) and pointing out that they are now in breach of the law for not providing separate sex loos, not to mention pointing out that the UN sees lack of separate sex loos as a bad thing.
I would also point out that if they dangle stonewall as any sort of reason for doing this, that they are a homophobic mysoginistic lobby group who have a vested interest in giving incorrect legal advice as that’s the result they are hoping for not to mention they include paedophiles as a legitimate trans group on their umbrella diagram (I’m sure I’ve seen that here, maybe somebody could verify that?).
I’d finish off with stats on articles about the problems adults have had with the introduction of mixed sex loos (Home Office, ministry of defence, rate of offences in mixed sex changing rooms in pools etc) to show how if adults struggle then kids will do too...
If your dd doesn’t want to be seen as making a fuss then I would say it is coming from you and you don’t expect her to suffer any repercussions as a result of you making a safeguarding complaint.
If you have a parents Facebook page, maybe ask on there for views on this without giving away your concerns to start with. Hopefully most normal parents will be outraged and you can suggest that everybody submits a safeguarding complaint so that you can’t all be fobbed off as being ‘the only person complaining’. And if there are known trans children at school (assuming it’s not a majority of kids!) then they get sympathy and understanding for their dysphoria but get to use the staff toilets to keep them and the rest of the children safe* and comfortable - and watch staff hackles complain they don’t want to be in that position - another string to argue so why should the rest of the students have to?
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- not trying to say that there’s anything unsafe about the trans students, it works about keeping them safe too, but trying - badly - to encapsulate why to keep the loos single sex rather than mixed sex and safety is always a big issue.