my friend was a widow for 10 years and has finally found love. but her 10 year old daughter is against the marriage. how can she make her agree?

i think the main reason here is that she is insecure, that someone else will replace her spot and you will love her less. you mentioned she is 10, and your friend has also been a widow for the same amount of time, which means she did not have a father at home. i think it is important for your friend to communicate openly with her and find out what is wrong. ask her to spend as much time possible with her daughter and give her lot of attention too. also, to help her know the man better, try to do joint outings, without making it seem as if you want her to like him. it is okay if she doesn't speak to him initially or is not happy. still ask your friend to try.