...
*visit visas tend to be
"a bit of a lottery", unfortunately ... as any agency worth its
salt should explain to you when you're applying for one. And the MAIN reason this is the case, is because
*they've - all too
frequently - been abused in the past by people who have then
outstayed the
validity of the dates for which their visas have been issued.
However, if your girlfriend can provide [adequate] proof that she
fully intends to go back to the Philippines afterwards ...
e.g., has a
job to return to - by means of obtaining a letter from her employer(s) to this effect - then it will
certainly enhance her chances.
Good Luck in your joint efforts.