have a look on that website to see the nearest office to ur gf,maybe if she goes there and will get a copy quicker its only 450 peso for the singleness 15 peso for stamp but its says it takes upto 9 days after payment and upto 6 days to post,but as i said it only took a week for my gf to get hers.
do u have the time to wait that long as u may need when u get the marriage license?