The 70-year-old woman was beaten last week, and the suspect allegedly used anti-Asian slurs before the attack.
But the victim's son says she is a Mexican-American from Highland Park.
The victim was left badly bruised with a broken nose and concussion.
Police records show 23-year-old Yasmine Beasley was arrested April 9.
Investigators are still determining whether the attack will be deemed a hate crime.