it will be extremely difficult for your girlfriend to apply a visitor visa to uk - unless you 2 are married.
a tourist visa would be unrealistic as well - uk tourist vias will only be issued to chinese applicants if they have joined a group of tourists.
further information can be found on the uk visa site or can c##被过滤##ult the international advisory office in university. alternatively can send an email enquiry to UKBApublicenquiries@UKBA.gsi.gov.uk
they are not quite helpful tho!