Sorry to hear that Pia is not feeling well, she might just be tired of the travel. It's good though that you've taken her and the baby with you, at least you can look after her.
I understand your worries, I'm sure it isn't so easy being away from family and friends whilst having a baby, back home there will be Nanay or Tita to help her look after the young one.
There are a number of Filipina living in Leeds, I have one good friend who lives there too. I hope one day Pia will be able to make new friends so she will have a 'support system' whilst living in this country. It helps a lot.