Lu, a farmer from a village on the Hubei province side of the bridge, was trying to gain passage for her daughter, 26-year-old Hu Ping, who has leukaemia. She has been unable to receive a second round of chemotherapy treatment in the overwhelmed hospitals of provincial capital Wuhan, the epicentre of the virus outbreak.
"My daughter needs to go to hospital in Jiujiang," she said at the checkpoint. "She needs to have her treatment. But they won't let us through."
Her daughter sat on the ground wrapped in a blanket while Lu tearfully pleaded with police.
"Please, take my daughter. I don't need to go past ... please, just let my daughter go past," she asked.
Her pleas were almost drowned out by a loudspeaker playing a pre-recorded message that residents would not be allowed into Jiujiang, the Jiangxi province city on the southern side of the Yangtze.
The bridge has been largely closed off in an attempt to halt the spread of the new disease, which has infected 14,380 people, the vast majority of them in China, and killed more than 300.
Dozens of people have attempted to cross the police checkpoint in recent days. Some had succeeded by holding the right train or plane ticket departing from Jiujiang and bought before January 24, but many had failed.
For much of Saturday morning, that was the case for Lu as she pleaded her daughter's case with authorities.
"All I want to do is save her life," she said.
About an hour after she spoke to Reuters at the checkpoint, police began to move. Phone calls were made, an ambulance was called and Lu and Hu were both eventually allowed through.Hu appeared to be limping as she walked through temperature checks at the checkpoint and towards the waiting ambulance.