She and two other former elite U.S. gymnasts came forward for the first time to describe what they say was repeated sexual abuse by Nassar, a volunteer doctor for USA Gymnastics for nearly three decades.
Dantzscher joined Jessica Howard, the U.S. national rhythmic gymnastics champion from 1999 to 2001, and Jeanette Antolin, a Pan American Games silver medallist, in detailing alleged abuse by Lawrence Nassar.
"We know that at least 60 have come forward, but my best estimate is it's in the hundreds and possibly more", Manly told CBS television's 60 Minutes program in a report to be broadcast Sunday.
According to Michigan Attorney General Bill Schuette, claims against Nassar started when a family-friend said she was sexually assaulted in his home from July 1998 until January 2005, when she was only a child.
"I mean, it happened all the way to the Olympics in Sydney, till I was 18", said gymnast Jamie Dantzscher. "He would tell me I was going to feel a pop and that that would put my hips back and help my back pain".
At the end of January, another woman said that she told MSU about the alleged abuse she endured from Nassar.
The victim in the sexual assault case - a woman now in her 20s - was neither a patient nor a gymnast, officials have said. A 25-year-old woman testified she was repeatedly molested from age 6 to 12.
"I think it's important that we take these things that have been hidden for so long and expose them because there hasn't been a change in the sports for 30 years", Antolin, who competed with the USA national team from 1995 to 2000, said Monday on "CBS This Morning".
Jessica Howard, a United States national champion in rhythmic gymnastics, remembers other girls talking about Nassar, that he would "touch you amusing", but no one complained about it.
"I remember being uncomfortable because of the area", Antolin, who was on the national team from 1995 to 2000 and competed at the 1999 world championships, said.
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Now in current federal court, the former doctor is being charged with possession of thousands of child pornography images, and attempting to destroy evidence. All worked with him at a national team training camp at a Texas ranch run by coaches Bela and Martha Karolyi.
USA Gymnastics declined to speak with the programme on camera.
The women said as girls they did not question Nassar's procedures partly because he was seen as a "good guy" in a hostile training environment at the ranch, and they trusted him because he was a doctor.
Klages lawyer said she never heard any allegations against Nassar and that if she had, she would have reacted immediately.
"There was tons of treatment that you got, including like getting your ankle taped".
She said she would hide underneath the sink in the basement, Nassar would find her, and then proceed to touch himself with lotion in front of her.
The MSU police chief said he has 17 officers investigating complaints against Nassar and they want anyone with information to come forward. He had previously left USA Gymnastics in 2015, at the time he said he was retiring.
USA Gymnastics responded to the report by saying it was "appalled that anyone would exploit a child in this manner". "And they put medals and money first", said John Manly, an attorney representing more than 40 women accusing Nassar of wrongdoing.