In the Philippines most airports including Manila require the booking confirmation/details to actually enter the terminal to check in. However once at the check in desk, simply handing over the passport is normally sufficient.
The primary details for her are the booking reference and the e-ticket number. If she logs into the airlines website, there is often a 'Manage my booking' section which will allow her to view her reservation and print out a confirmation. She can also check in online and choose her seat.
She will need the 6 character booking reference and her surname to enter the manage my booking.

Don't worry, I'm sure everything will come together.