It was during a training camp in Spanish Alicante that the accident happened.
She was in Spain with the Dutch national team this week and lost consciousness after the collision, and was then taken by ambulance helicopter to hospital.
She was then operated on to relieve the pressure on her brain caused by the accident, and ever since, she has been in an artificial coma.
Breathe independently
But now comes the positive news.
Her stable SD Worx writes on its website that 30-year-old Pieters, who now breathes independently, will tomorrow be flown to a hospital in his native Netherlands.
Her condition is described as stable, but unchanged.
But only when she wakes up will the doctors be able to get an idea of which ones she can get.
Pieters is primarily a successful velodrome cyclist, and as recently as October took a World Cup gold in the Madison branch.
But she has also had great success in road cycling, with, among other things, two European Championship and one World Cup gold 2019 on the merit list.