I am assuming this is a one way flight, correct?
Technically only Filipino citizens have to do E-travel when leaving the Philippines. Dual citizens like your daughter are not required to do it. However, no harm in doing it.
This probably does not apply to them, but here is a bit more e-travel info.
Coming in to the Philippines, all passengers must do it and all the health declaration stuff is included.
If travelling from the Philippines and back (round trip) it is nice to install the app on your phone. It will save all of your info from your outbound flight and when coming back, you just have to fill in the flight details and do the health declaration. Very helpful when travelling with a family.
I just travelled with the family a few weeks ago and my Filipino wife travelled a few months back. On the outbound flight, they never asked about e-travel. I think they have it the system and don't ask anything about it, if it is done. Coming back into the Philippines (this was Clark) they have a checkpoint and you have to show them the e-travel QR code. If you have not done it you will have to do it then and there, on your phone.
Personally, I prefer to have the QR code printed