If come alone, you have to apply for her a endorsed letter with a red stamp on the top right corner from the Phi embassy in Singapore.
You have to state the reason n documents submit to the cb counter staffs too. Better check n confirm what documents before going down personally if not you will want to bash the counter staffs up..
This letter if approve then u need to mail to your partner in phi n she will use this to show to their own cb immigration for clearance. but still up to their own discretion. but chance will be higher with the embassy approval.