She uses Alipay Cross Border https://global.alipay.com/ospay/home.htm which converts every transaction to GBP and remits the value to a GBP bank account.

(Try going through to the payment page and you see the conversion to GBP happening.)

Looking at the html of the payment screen, it appears there’s some kind of "payment_method_alipay_cross_border" woocommerce payment plugin, which suggests that AliPay are handling it somehow.

But since her family has business links in China, it probably isn’t a big deal if she gets paid in ￥ - there’s probably something they can spend it on over there & the family can compensate her here in £.