Kirsty Parker, 34, from Denholm, died at the scene of the incident on the A698 near the village on February 11.
Three of her children, aged one, nine and 12, were also travelling in the car and were taken to hospital with non-life threatening injuries. They have all since been discharged.
Ms Parker was driving a Vauxhall Zafira which collided with a Peugeot 207 at around 4.15pm. The driver of the other car, a 26-year-old man, was also taken for treatment.
In a statement issued through Police Scotland, her family said: “Kirsty was devoted to her family and we are still trying to come to terms with our tragic loss.
“She was a much loved mum to Jessica, 16, Kyle, 12, Mackenzie, nine, and John Paul, two, and planned to marry her fiance, Chris, in September.
“As a family we enjoyed many trips to the countryside to walk, camp and fish and we will cherish these fond memories forever.
“We’d like to thank the local community for all their support so far at what has been an incredibly difficult time.
“We understand that officers are still trying to trace witnesses who were in the area at the time of the collision, and would ask anyone who can help police with their inquiries to come forward.”