"So I decided to do something a little vulnerable for me, but something we both loved to do together - sing. This is the piano her father gave her and this was one of her favourite songs. (sic)"
Billie - who also lost her grandmother Debbie Reynolds one day after Carrie died - added her career as an actress helps her stay "happy" in the wake of her mother's passing, and hopes the song can "encourage" others who have lost someone to "keep on moving".
She continued: "And as the song says, we must "keep on moving". I've found that what keeps me moving is doing things that make me happy, working hard on the things that I'm passionate about and surrounding myself with people I love and making them smile.
"I hope this encourages anyone feeling a little low or lost to "keep on moving". As my Momby once said, "take your broken heart and turn it into art" - whatever that art may be for you. (sic)"