A week should be enough IMO.
Make sure she brings a roaming sim with her so the family in the Phils can text her cheaply.
Get her to use Chikkatext on a pc in the UK to text back to her family.
I have always phoned my wife at least 3 times a day from work, and often more
Give her money to do the shopping and allow her independence in this regard.
Allow her to send money home every couple of months.
Make her feel loved all the time, tell her constantly, and she will be happy
