Just looking for some advice really.
DD1 is 16, struggled with poor mental health towards the end of 2019 - we sought professional help and she was back to her usual loud, happy, all singing and dancing self not long after.
Since April/May, she's not been herself at all, very very quiet and irritable, not wanting to do things that even 6 months ago she'd have jumped at the chance, hasn't spoken to any of her friends since the day of their last GCSE (she's always been one of the quieter ones at school but has been in a very stable friendship group since y8) and has developed a very short temper out of nowhere (over things that previously would never have bothered her - eg her sister borrowing her phone charger without asking and "forgetting" to return it). On multiple occasions, I've come across her just sat doing a puzzle/reading/colouring/in bed with tears streaming down her face only for her to tell me not to worry, she's fine (which she clearly isn't). She goes through obsessive (perhaps not the word I'm looking for?) phases - currently it's cooking everyone dinner every night because she's worried she might get food poisoning, a couple of weeks ago she would rearrange her wardrobes every day, just random things that would be important to her for about a week and then never mentioned again.
On the flip side, after finishing her GCSEs, she did 3 weeks work experience at the school I work at and all I heard from other staff the whole time was how lovely, helpful, enthusiastic and chatty she was! She seemed to really enjoy this, was noticeably happier in herself during these weeks, yet the day she finished (mid last week), she was back to the recent quiet and irritable mood.
She doesn't have TikTok/Snapchat etc, just a private Instagram account to follow a handful of family members so I don't have any concerns about things happening over social media (have also checked her phone a couple of times which she handed over with no fuss).
At first I put it down to the stress of exams but I've realised there's a lot more to it than that. I've put her on a waiting list back with the same psychiatrist she saw in 2019 but it's currently a 12-18 month wait so any advice would be greatly appreciated in the meantime.