blessed23

1. Yes, it's legal to enter the US on a tourist visa to marry and leave the US.
2. No. If you tell the CBP, you might be put on the next plane back home. Don't lie. But you do not have to volunteer information either.
3. It varies in every community. Check with the local courthouse where your fiancee lives. Or you can go to Las Vegas and get marry in an hour.
4. Yes, two weeks is plenty.
5. Yes, she can file as soon as she gets a certified copy of the marriage certificate.
6. Wouldn't it be easier and less risky for her to fly to the Philippines for 2 weeks? Why take the risk that you may not be allowed to enter the US?

Hi blessed!I got married with a green card holder in the US, after this I come back to my country and I'm waiting for case complete.
answers to your questions:
1. It is legal. It is legal if you later return to your own country, if not, for them is a fraud; I must tell you also, this is the shortest route, but not the most correct...actually getting married in US should apply for a visa specifically for this.
2.NO, if you tell you wanna get married they can denied your entry, because think you can enter and remain.
3.For permanent resident just green card, I'm not really sure. For you just a passport.
4.I don't know, maybe depends on the state in which you are located, for me, in Michigan, we do all in 1 day.
5.Yes, you need some documents and after can send I-130.

Yes you can file immediately. I filed my husband's I 130, 10 days after our wedding

I try to answer your questions but I'm no expert.
Yes that's legal.
I think that's the only way since she is a GC holder. You have to get married otherwise she can't even apply for you.
Normally, it takes between 6-10 months for USCIS to approve the case and send it to NVC. But you need to send too many documents to prove your relationship e.g. photo of you together, a joint bank account, a joint rental contract, common property and stuff like that. Be meticulous because if the USCIS rejects you, then you have to wait another 6-10 months.