Susan Boyle received a standing ovation when she sang at the Britain's Got Talent tour in Glasgow, a day after cancelling two concerts.
Her publicist said the singer received a "rapturous" reception from the audience at the city's SECC venue.
The singer from West Lothian had been advised to rest rather than perform at two shows in Manchester on Sunday.
Boyle had previously been treated for exhaustion after coming second in the ITV1 talent show.
Publicist Nicola Phillips said the crowd in Glasgow broke into applause halfway through her performance of Memory, from the musical Cats.
She also sang I Dreamed a Dream from Les Miserables, the song that propelled her to international fame.
Boyle had performed both songs in Birmingham on Friday and sang during matinee and evening shows in Sheffield on Saturday.
But in the later concerts she appeared to stumble over the words to Memory and received a mixed reaction from the audience.
Piers Morgan says Susan Boyle is 'fine' - courtesy of BBC HARDtalk
Concert-goers at the Manchester Evening News Arena arrived on Sunday to find notices announcing Boyle would not perform at either of the scheduled matinee or evening shows.
"She sends her sincere apologies to her fans for not appearing in Manchester," her spokesman said.
The crowd in Manchester booed after Britain's Got More Talent presenter Stephen Mulhern told the audience Boyle would not be performing, before a video clip of her "journey" was played on stage.
Ticket holders had the option of a refund if they decided they did not want to watch the show - but a spokesman for the MEN arena said only seven people asked for their money back over the course of two shows.
The arena tour, which will travel across the UK until the end of June, showcases winning act Diversity plus some of the other finalists and semi-finalists, including Boyle.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.