Next time have the passport opened at the page of visa when you present it ,,or at least check they stamp you in properly ,,so check and know number of page with the correct visa
ok ..then it’s good advise …before definitely I didn’t need to leave ,,but maybe different rules for different nationalities ..non the less ,they are an authentic school ,,so their advise is solid….they can also advise her what embassy to go too …she might not have to go back China …she just needs to ask the questions ,,there are lots of Chinese students there
no doubt the visa application cost will triple and invariably a high percentage will fail not for any reason apart from uk getting money for nothing in the pretence of government