to enter Qatar she has to get a Visa first. it is not always easy for Filipinas. Then you guys cannot get marry right away, because neither of you is Resident in Qatar. Then even when you will get your Residency ( at leastcouple of months), I am not sure what about her, whether she also have to be a qatari resident or not...
Why wouldn't you marry in Abu Dhabi or Dubai - wherever the Philippins embassy is.I think you have to do it through the embassy. And she will need all kind of papers that she is free to marry.. looks complicated...

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“You become responsible forever for what you have tamed”. Antoine de Saint-Exupéry