Before the release of The Donnas' album Gold Medal, Castellano developed tendonitis. In October 2003, she had surgery for it. During her recovery, she had to take drum lessons to re-learn to hold drum sticks the correct way. For Gold Medal, she recorded with her recovering wrists, but could only play for short periods of time.
A shoulder problem forced Castellano to withdraw from The Donnas' tour following a show on December 27, 2008 at the House Of Blues in Anaheim, CA. Amy Cesari of the band The Demonics filled in on future tour dates. On July 9, 2010, Castellano announced on the band's website that due to her shoulder she would have to retire from drumming and performing with The Donnas. Castellano still attended events the band was involved with as well as promoted the last album she recorded with the band, Greatest Hits Volume 16.