As BlueBird pointed out - you do NOT have correct info...
No problem to buy a one way ticket - my Maricel just recently arrived on one (fiancée visa).
Don't forget about CFO - good point as well...
On the airport she will have to pay PHP 1.600 as a travel tax - only if you bought your ticket outside Philippines (over the internet etc.), if you bought the ticket through the agent in Phils the tax is included in price.
Also she will have to pay so called " airport user fee" at NAIA which is currently PHP 750...
So in total - tell her to keep about PHP 2.500 as pocket money for the airport
Good luck
