The girl was among a group of people about 8:30 p.m. in the first-block of North Michigan Avenue, near Millennium Park, when a person fired shots in their direction, Chicago police said.
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She suffered a gunshot wound to the back and is being treated at Comer Children's Hospital, where she was listed in serious condition, according to police.
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No arrests were made.
The girl's aunt, whom did not want to be identifed, said she is doing OK.
"Praise God is all I can say," the aunt said. "You would think, you know, in Millennium Park, where it's supposed to be a safe haven and one of Chicago's most scenic areas, I remember going there as a child, so to think of something like this happening in an area like that, it just makes me feel very unsafe. It makes me feel like my nieces and nephews aren't safe."
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According to her aunt, the girl was in pain, but no one realized she had been shot until doctors discovered she was bleeding internally.
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Chicago police officials are canceling days off for officers later this week and to cover weekend shifts after a recent spurt of downtown violence, according to an internal CPD memo obtained late Monday by the I-Team.
Sun-Times Media contributed to this report.