Robinson-Earl/Splash News Online
06/19/2008 at 05:40 PM EDT
is undergoing further hospital
tests in the wake of her collapse Monday
in her London home,
The soul diva, 24, was given additional scans and tests Thursday, says her rep, Chris Goodman.
Winehouse is due to perform June 27 at a concert marking
Nelson Mandela's 90th birthday. The next day she is supposed to participate in England's Glastonbury music
Goodman says both dates remain in place, though a final decision "will be made entirely on the advice of her doctors and in her best interests."
– Stephen M. Silverman