Well, the PayPal payment went through. Invoice ID was 210503-044102-4593. I just checked the profile on the Sara shop, and the email address there is correct. I just sent an email to test it out again, and it works fine - it took about 12 seconds to arrive after clicking send.
I have many (many!) emails. I use a catch-all address, and every organisation I email gets a different email address at the catchall domain, named after them (in this case 'Sara@...') It's not really useful for this circumstance (at least, I hope not) but it's a habit now. I use it to find out who sells my email to other places - if I start getting spam/marketing from someone obviously not <real address>@<catch-all> then I know <real-address> have either been hacked or are selling my identity, modulo the name of the company being a reasonable guess (like in this case [grin])
Anyway, hopefully the above is sufficient to find the order. PayPal definitely think it was paid...