As said by Steve, there is absolutely nothing you can do, only be there to listen to your fiancée and comfort. If you have never been to a Filipino funeral before then don't think it is like here. Of course everyone is upset and emotional but everyone will be busy getting things ready for the Wake. Her Lola will be placed in her coffin and brought back to the house for 4 to 5 days before the funeral itself. Durning that time many people will attend every night at the wake when they will drink coffee, play tong-it and eat snacks provided by her family. It is not a real sad occasion, more a great rememberance of her life. All the family from everywhere will be there to visit and help.
On the day of the funeral, the coffin will be put in a hearse or horse and cart and taken slowly to the church and all the family and friends will walk behind, maybe you have seen this before when you were there. After the service she will be taken to the cemetery and entombed. In my experience, the walk and the church are the most emotional times as this is the last time anyone will see their loved one, all you can do is support them.

From here, you can't do much, don't send flowers as the family will already have them sorted.

But please give my condolences to your fiancée