based in my experience dealing with the ticketing agency for our staffs - if the ticket is originating Doha, then by all means first ticket sequence (Doha/Manila) should be use first before you can use the Manila/Doha.
it will be a problem since your daughter will not use the first sequence but only the second sequence.
better you clarify that with your travel agent or the airline - or you lose more money instead of saving few...