The family of Ruth Maguire has described the 30-year-old as "irreplaceable".
The devoted mum-of-three's body was found in Carlingford Lough on Monday.
She had disappeared after a night out celebrating a friend's hen party on Saturday.
Ruth's mum Geraldine Worthington said: "She was a ray of sunshine to everybody."
Ruth Maguire partner thanks coastguard for working to find his "soul mate"
In an interview with UTV, Geraldine added she knew something was wrong when Ruth had not contacted her partner James.
She said: "I knew right away... because of the type of person she was. She kept in contact with everybody, she would have phoned Jim right away as soon as she left the bar at 11.30pm, she would have been in contact the next morning organising everything for the children... It's just how she was, she kept in contact with them all day."
Originally from Belfast but living in Newcastle, Co Down , it is believed the tragic mum fell into Carlingford Lough after leaving Taaffe’s Bar. Her body was discovered close to Haulbowline Lighthouse at the entrance to the Lough.
Her sister Rachel Wilkinson added: "She wasn't a drinker so therefore any sort of small amount of alcohol was going to affect her more. She obviously lost her bearings."
Ruth Maguire's friend in poignant tribute after tragic hen do death
Ruth's heartbroken fiance sent a message of thanks to the coastguards and emergency services who battled to find his "soul mate".
In an emotional statement, James Griffin also said Ruth would have become "Mrs Griffin" on August 8.
A death notice released by Ruth's family revealed the young mum will be laid to rest this Saturday.
The notice read: "Beloved partner of James, loving mother of Tyler, Lydia and Oliver, daughter of Geraldine and Malachy, sister of Raymond, Rachel and Ryan.
"Ruth will arrive at St Vincent de Paul Church for 9am Requiem Mass on Saturday March 23.
"Funeral afterwards to Carnmoney Cemetery for committal at 11am. Deeply regretted by her loving partner, children, parents, brothers, sister and family circle."
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