Dani, I love it, I'm not a big fan of Grace myself , but don't go by me as I don't like anything on the top 100 listing.... I do like Gracie tho.... ha I love the Sandra bullock films - miss congeniality, and she is Gracie Lou Freebush in that... It really does suit an adult too, very pretty.. The only thing I would say is the ring of it when you say it without middle name, Gracie Busby, so both names end in an ee sound, but then that may work too.
I love , love , love the middle name you made up -very pretty again, very unique..