The Look Who's Talking actress collapsed during rehearsals earlier this week after her blood sugar levels dropped as a result of not eating.
Following the incident, Alley has taken the advice of partner Maksim Chmerkovskiy and upped her calorie intake to 2,000 per day rather than the 1,400 she was previously consuming.
"He's probably right. Usually what I do to lose weight, I eat 1,400 calories, but I guess if I'm working out five or seven hours then you have to change it around a little bit," she told Entertainment Weekly.
"When I fell off the stage, I [saw] three stairs below me and I started going into slow motion and in my mind, I go, 'OK, there are three stairs, you have on heels, jump bitch, because you're either going to break something or you're going to take control of this', and that's why I jumped."
Alley previously confessed that she hoped to reach her goal weight while appearing on Dancing and has since revealed that she is almost a size 6.
Dancing with the Stars airs Mondays and Tuesdays on ABC.