Congratulations on the great news. That didn't take very long. I truly hope this works out for you.
The relationship between the Chinese and Filipino governments is quite strained right now. Apparently, the Philippine government recently captured a Chinese vessel in Philippine waters, confiscated the boat, and arrested all passengers. China isn't happy about it and, par for the course, is being quite vindictive towards all Filipinos in China as a matter of policy.
If the girl has never been to mainland China before, she should be able to get a 30-day tourist visa without too much difficulty. Once in China, you can renew that L-visa twice for a total stay of three months. After that, your options for keeping her in China become quite limited.
One possibility would be to enroll her in a licensed Chinese language program for one year so that she can qualify for a student X-visa. The officials will scrutinize her application very carefully: You will have to prove that she has paid full tuition in advance and that she has the means to support herself while in China. You can list yourself as her financial sponsor but that will throw up a red flag that the real intent is for her to remain in China with you. Once they learn that she arrived in China on a tourist visa with you, they may deny the X-visa application just to spite her. The only other option is to marry her prior to the end of the third month (or at some later time in order to return her to China).
You could marry her in the Philippines but you will have to apply in person and remain there during the entire wait period. You will have to plan on spending at least three weeks in Manila.
The easiest way to tie the knot with another foreigner in China is to travel to Hong Kong. There are no residency requirements, you do not have to be physically present in Hong Kong during the 15-day wait period, and the application and fees can be sent via DHL. You can arrange everything by e-mail and postal service and then just show up one day before the scheduled wedding day. For more information, see the Guide's chapter on
Getting Married in China.