Gee Hayley looks so big compared to little Mandy, and Hayley's still a kitten herself.

Little Mandy is just adorable! And I love that picture of her playing with Hayley's tail - too cute. I'm sure they will be best of friends, especially if Mandy is following Hayley around all the time. I think you did the right thing by getting the kitten when Hayley is still a kitten herself so they can bond like this.