Zookeepers made her a birthday "cake" with fruits, vegetables and flavored ice to celebrate the day, one the zoo was not sure would come, it said in a press release.
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Layla has been battling a life-threatening sinus infection since last December, and it was not until this August that she was able to comfortably breathe through both nostrils, the zoo said.
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"We are very grateful and appreciative to those who have worked closely with our dedicated staff in doing everything possible to help Layla and give her the best chance of celebrating many more birthdays," Michael Adkesson, vice president of clinical medicine for the Chicago Zoological Society, said in the release.