On August 9th, Katie passed away, to a massive outpouring of grief from the Star Wars community. Through her ordeal, she became a focal point and inspiration for the 501st Legion’s charitable efforts.
In 2006, the R2 Builder’s club completed their own droid, and presented it to Johnson, who’s brought the droid out to charitable events over the years. Hasbro even made a limited edition action figure.
It might have ended with that, but soon, the director of The Clone Wars, David Filoni, learned about the droid and incorporated her appearance into the television show as QT-KT, a droid owned by Aayla Secura. R2-KT also seems to have made her own appearances in the show. (Source)