David Perry, a family spokesman, said her family were "stunned" and were enduring a "nightmare".
The hospital and sheriff's department conducted a search of the premises and Ms Spalding's friends and relatives spent days scouring the streets of the California city with flyers.
They said they were "under the assumption San Francisco General had been searched."
Mr Perry said: "Lynne Spalding died alone, in the stairwell, at one of the finest medical institutions in this country.
"I hear that the San Francisco Sheriff's Department initiated a search. Well, evidently it wasn't a very good one. I think there are a lot of questions to be asked."
More top news
The woman had been at the O2 Academy on Westgate Road with friends when she was attacked on Pink Lane in Newcastle city centre.
Lewis Rider, who turns 23 on September 7th, purchased the scratchcard this week whilst buying a tin of food for his dog, Marley.
The newborn baby boy, who was treated by hospital staff, was found by a dog who started barking to alert his owners.