The mother-of-one, who disappeared from her Clondalkin home just over a year ago, had made plans with her sister Berna Fidan to travel to New York for the special occasion.
"It's a very hard day for all of us, it was supposed to be Esra's big day, her turning 40.
"A few months before she went missing, we were talking about her age, and she said she would love to go to New York and celebrate her 40th.
"Esra and I had not had been on holiday together for 20 years so it was a really big thing, we were really looking forward to it. But a year after she went missing, we still haven't got any information about what happened." Berna was in Ireland last month to mark the day of Esra's disappearance, February 23.
She was accompanied by her daughter Ayda Pekkaya and one of Esra's close childhood friends, Ilknur Maccormick.
The three insisted that Esra could not have been driving the car that was found abandoned in Bray, after carefully watching CCTV footage of the area.
Footage showed that the grey Renault Twingo, entered the car park around 8.20am, drove out and came back around 8.40am after having a near collision with a Skoda Octavia.
"I taught Esra how to drive and remember very well the type of driver she was, she was incredibly cautious and that near-collision was the result of very aggressive driving," Ilknur told the Herald.
"Esra was never erratic, she had to take her driving test seven times because she was overly cautious.
"The footage shows that Esra's car pulled in, in front of the Skoda, and the normal reaction would be to continue on or to stop and let the other car pass, but in this case, it slows down slightly and then goes right behind the other driver bumper to bumper -- that's aggressive driving."
Berna dismissed suicide as Esra had been excited about their mum's upcoming visit to Dublin.
"The last conversations we all had with her were about my mum going over to see her, and the list of Turkish spices she should bring with her that can't be found in Ireland.
"Her neighbours said that she was so happy about the visit that she had done a big spring clean of the house."
Anyone with information is asked to contact the Garda Confidential Line on 1800 666 111.