You probably will not be pleased with this answer, but here goes. It sounds like you have a green card. If that is the case your options are somewhat limited.
You could get married (either here or abroad). If you get married here she can apply for an adjustment of status and go that route. If you get married abroad, she may qualify for a V visa (spouse of an LPR).
If you are a national of a country other than the Philippines, she may be able to get a priority date based on your nationality. Otherwise, she will be in for a long wait (you can see the estimated waiting times for immigrant visas at www.uscis.gov).
Another option is for your fiance to take advantage of the special programs offered to Filipinos for them to get their green cards based on employment. One that comes to mind is a program giving preference to Filipino RNs, although there may be others. Depending on her occupation and education, she can also apply for a regular non-immigrant work visa (h1 or others) and legally reside in the US in that status until her priority date comes up.
If you are an American citizen, then you can get married abroad and petition for her as the spouse of an American citizen or you can petition for her to get a K1 visa.