The spokeswoman said the 48-year-old Scottish singer took a break Sunday, but is scheduled to perform in Glasgow on Monday night.
"She had one rest day, but she will be back on stage tonight," she said, adding that she expected Boyle to take part in the rest of the tour, which runs until early July. The spokeswoman spoke anonymously in line with company policy.
Boyle, whose first appearance on the TV talent show generated had millions of YouTube hits and compliments from around the world, had been hospitalized a few weeks ago for exhaustion after finishing second in the competition.
The church volunteer was due on stage for a matinee and evening show at the Manchester Evening News Arena on Sunday, but did not perform.
She received standing ovations at the tour's previous shows in Birmingham and Sheffield.
Copyright 2009 The Associated Press.