Amy Winehouse on June 23, leaving the hospital
06/24/2008 at 07:00 AM EDT
Frail singer Amy Winehouse
is still battling her serious lung condition – but that didn't stop her from rehearsing for an upcoming gig or
The 24-year-old checked out of her London hospital for a few hours Monday to practice for her performance at Nelson Mandela's birthday celebration
this Friday. (She also found time to shop for a new pair of her trademark ballet shoes.)
Despite her father Mitch's previous claims
, reps now say Winehouse is not
suffering from emphysema. It's a "scarring of the lungs which could lead to emphysema", says spokesman Chris Goodman. "If she keeps doing the wrong things, then it could lead to it. If she does the right things, it won't."
Doctors have warned that smoking is one of those "don'ts." But the troubled singer was seen with a lit cigarette during her furlough from the clinic.
Still, concert organizers were happy with Winehouse's rehearsal, Goodman says. "Doctors have to give it the final sign off, but it went well," he adds. "She will really enjoy it – she always does."