Anxiety is very easy to feed, as a parent we often fall into the feeder category.
Life is full of choices. Should I open my eyes in the morning or pull the duvet cover back over my head? As adults we have learnt to accept the concequences. Sometimes, we do pull the duvet back over. That might mean the kitchen is a sty when we get up, we're putting the load on our other half to deal with DC and will owe them a return favour, we have to rush off to work without breakfast because we've made the call to stay in bed.
She has many choices to make each day, does she have any consequences of the outcomes of her choices?
Some are inconsequential like with lunch would you like a tuna or cheese jacket, once they're made up if she hasn't chosen, you choose which and follow up with I'll have the tuna that leaves the cheese for you. No further discussion, choice was given, choice was taken not to decide. No punishment/ reward of any choice just consequence. By not choosing the choice was made for her.
The basics of life are not up for negotiation in our house. Getting up, washed, dressed. Eating three meals a day, being civil or apologising when you've slipped up. Bedtime routine and sleeping are a big deal too. I say even if you can't sleep, resting in bed during the night time hours helps you and the rest of the family to stay in a routine.
The consequence of not staying in bed or messing around significantly at bedtime resulting in being tired and grouchy, are a few days of earlier wind down before bed time. So tech off at say 7pm. Not eating food is all meals/ food at table and stay at table until they're eaten.
The fundamentals of sleep, nourishment and fresh air are the basics for building the rest of life on. If these have slipped off the priority list then I find everything else goes up the spout as well.
She hasn't really engaged with school work for months - how much of this is choice with no consideration to consequence? If her anxieties are around being behind, that has been her choice. Its happened, it is what it is and now she is faced with new choices. She has the choice to re-engage and gather the work (with lots of support) to be closer to where she should be come September. She also has the choice to acknowledge where she is and request that she's included in catch up sessions that every school will no doubt be doing for year 11's. She has the choice to not push herself too hard and accept that if she'd like to pursue academically beyond yr 11 she may need to resit core subjects down the line.
Its not rights and wrongs. As a young adult she is making choices, they have consequences and as a parent we help encourage towards choices but they are the only ones who can manage the consequences of their decisssions. You can reinforce none of these choices are catastophic. They just lead down different paths.
There are about 9/ 10 weeks before September school. Even if she hasn't engaged since lockdown, she has the choice to start to engage now and have topics she's on top of. The choice to remove some pressure on say 2 subjects so she knows when she heads back in September those are in hand. Maths, English and Science were the three I insisted DS keep upto speed on. Maths and English levels at GCSE are still one of those core things that get asked for on applications throughout life and if you get below a level 4 I think you now have to resit at 17 and again at 18 unless a level 4 is achieved in the first resit. So the consequence of not working is the acceptance of delaying inevitable work.