Cashier's Dream, who had shown improvement following surgery for a twisted intestine, died Monday night at Hagyard, Davidson, McGee equine clinic in Lexington, Ky.The daughter of Service Stripe, owned by Team Valor and Heiligbrodt Racing Stables, had been pointing for the Prioress Stakes (gr. I) at Belmont when she was taken ill with what was believed to be a severe case of colic.Following surgery last Tuesday, where eight to 10 feet of intestine were removed, there was hope she was out of danger. But Team Valor president Barry Irwin said the filly "basically never got over it.""Dr. (Robert) Hunt was pessimistic," Irwin added, "because there's always the fear that whatever initiated this could still be at work, and no one really knows enough about horses to know for sure what's going to happen. He said they just have to sew her up and see what happens. A blockage formed, which became toxic, and gangrene set in. It's such a shame, because we never really got her cranked up. There's no way of knowing just how good she really was."Cashier's Dream's big moment came in last year's grade I Spinaway Stakes, which she won by six lengths. She also captured the Debutante and La Troienne at Churchill Downs, and was second in the Frizette and Adirondack Stakes. She also set a new track record at Churchill Downs for 5 1/2 furlongs, covering the distance in 1:02.52.After her first two career starts, Cashier's Dream was purchased privately from owner-breeders James and Laura Jackson of Diamond J Ranch and turned over to trainer Steve Asmussen.