Im so sorry for you and your friend. It WASN'T your fault....like slick said, you didn't know that the kitten had FIP...so please don't feel like its your fault and blame yourself. You were trying to bring joy into both of their lives, and I think you did well, even though it had a sad ending... Your friend brought joy into the kittens life by giving it a loving, peaceful home, and the kitten brought joy to your friend because your friend knew she was helping the kitten and loving it...whenever people help someone or something they get joy inside....in a way its bittersweet....theres sadness in it knowing that the kitten is no longer with her, but theres joy in it knowing that she gave him a better life. {{{{{HUGS}}}}}} to both of you. I am so sorry.