The spokesperson told the BBC that she was likely to lose more weight in the coming months.
The surgery was performed by a team of doctors led by bariatric surgeon, Dr Muffazal Lakdawala.
Bariatric surgery, also known as weight loss surgery, is used as a last resort to treat people who are dangerously obese (having a body mass index of 40 or above or 35 plus other obesity-related health conditions).
Ms Abd El Aty's family says she weighed 5kg (11lb) at birth and was diagnosed with elephantiasis, a condition in which body parts swell due to a parasitic infection.
By the time she was 11, her weight had risen sharply and she suffered a stroke which left her bedridden.
She is cared for by her mother and sister.
However, Dr Lakdawala told the BBC in December that he believed Ms Abd El Aty did not have elephantiasis but suffered from obesity-related lymphoedema which causes gigantic swelling of the legs.
Bariatric surgery, also known as weight loss surgery, is used as a last resort to treat people who are dangerously obese and carrying an excessive amount of body fat.
The two most common types of weight loss surgery are:
Gastric band, where a band is used to reduce the size of the stomach so a smaller amount of food is required to make someone feel full
Gastric bypass, where the digestive system is re-routed past most of the stomach so less food is digested to make someone feel full