Hi Rose, neither of my kids has PDA but some of their home ed friends do. Mine are now 22 and 15, so we've seen how it turned out for several of their pals. Most parents I know who are home educating kids with PDA use an unschooling (autonomous education) approach, which is the same approach I use. In this style of home education, parents let their children make the decisions about what, how, and when to learn. That can reduce anxiety for children with PDA. And frankly, some of my friends say there was no alternative for them because more school-like approaches to home education proved completely unworkable, so the decision was taken out of their hands.
So, you don't have to be your daughter's teacher or even her "teacher". You can instead be her facilitator, the person who helps her learn whatever she wants to learn. For example, if she is fascinated by owls, you might take her to the library, search for YouTube videos, and find a local birdwatching group for her.
You may find that with fewer demands on her, your daughter eventually takes more interest in social settings and feels able to cope with them because she isn't totally overwhelmed. It might be just a few select social settings, but that is okay - adults don't have to spend six hours a day in a crowded room with 30 other people, so why do we force our kids to do it if they don't want to? I don't have autism, but I'm an introvert and I changed career on realising that talking to people all day long was creating low-level stress for me. It could be that she wants little to do with other people for quite a long time after coming out of school while she recovers, but there's no rush. My daughter's friend who has PDA was perfectly happy just with his mum for a very long time in lockdown; only after 18 months did he start really missing his friends and start asking to meet them in the park - mind you, he had been chatting online with them once or twice a week throughout.
My friends who are parenting kids with PDA tell me there is a balance to be struck between keeping kids happy and relaxed by not putting them in stressful situations, and gently encouraging them to be in social situations so it doesn't build up in their minds into something they feel unable to do.
In some cases, it seems like they are very fixed in their ways and will never change. Then they transform when you least expect it. One lad was obsessed with buses from infancy until about 11 and his mum was sure this would be his career - then he lost interest in buses and shifted to politics and military history. Now he's a young teenager who says he might become an academic. Another was adamant he would never do formal study of any sort, would not sit GCSEs, and was certainly never going to university because he hated school. Then at 14 he said he thought he'd do one IGCSE in a subject he thought looked not too difficult. That was okay, and over the next two years he got excellent results in a range of subjects and decided to go to sixth form, much to everyone's surprise. He found sixth form quite good and is now on track for very good A levels and going to university in the autumn. He never would take ANY advice from his parents on subject selection or studying, and they found it very hard to sit back and watch him do very little work outside of class - but he knew what results he needed and had no interest in any extra work! A third young adult we know was not at all academically motivated. He struggled through a set of GCSEs under duress, getting decent results with a lot of graft, and then did an apprenticeship, moving into full-time work in an unrelated field at 23. It can't be said that he's enjoying his work - he'd really rather do his hobbies and not work at all, but he lives with his parents and they insist he contributes financially. I guess that's not unusual with young adults!
There are many stories and many paths which young people can follow. Some look like conventional "success stories" and some don't. Given that your daughter's anxiety is huge right now, it may be that school simply isn't an option as it would damage her. If that's the case, the question isn't whether to home educate, but exactly how.