Hmmmm very sad story but also a blessing too cos you have the beautiful baby girl.
There are many decent British men that will gladly take on a woman with an existing child/children. It is much more acceptable here in Western culture. I have a Guesthouse business in Mindanao based a few hours from Cagayan if your Sister wants to meet a nice Western guy i have friends staying with me who want to meet a nice Filipina for a steady relationship, if your Sister is an honest and trustworthy Pinay i am sure i can pass on her details to a person that can hopefully in the future provide and support for her and her daughter if they mutually grow to like and then love each other. Message me here and we can hopefully match her up.