Hi!
Maybe it could be useful for you to know that BA flights in M normally credit at a rate of 25% to QFF, but the LHR-SYD route credits at 100% (all BA flights from LHR to SIN/BKK and on to Australia do so).
British Airways (BA) EGKLMNOQRSV Discount Economy* 0.25
Status Credits are earned on all eligible booking classes.
*Exception: Travel in Discount Economy between:
- Adelaide, Brisbane, Darwin, Melbourne, Perth or Sydney and London or Frankfurt via Bangkok or Singapore
- Adelaide, Brisbane, Darwin, Melbourne, Perth or Sydney and Bangkok or Singapore
- London or Frankfurt and Bangkok or Singapore
will earn a Base Rate of 1.
Therefore if you credit the whole trip to QFF you'd get sthg like that (just an estimate):
LHR-SYD BA 10600 miles at 100% = 10600 pts
SYD-LAX QF 7500 miles at 100% = 7500 pts
LAX-LHR BA 5500 miles at 25% = 1375 pts
Total credit to QFF 19475 points. AA would give you much less (although burning rates are better).
And if she has at least one activity every three years, her QF account will stay alive and her points will never expire.
Almost forgot: you can credit EI flights to QFF too, although at a rate of 0.7 only. This would give you an additional 390 points for DUB-LHR-DUB.