The only way she can use UC's ex-UK is on the following flights:
QF1/2 LHR-BKK
QF9/10 LHR-SIN
QF31/32 LHR-SIN
These all continue to Australia (either SYD or MEL) but she can stop or terminate in Asia.
Only other close option is QF5/6 FRA-SIN.
UC's can only be used on QF flights with a QF flight number and operated by QF (not codeshares).