by the way I am NOT a doctor, I am on insulin and I too have taken the wrong insulin at times.
the levemir is a long acting insulin so it will be in her system for 24 hours.
what is here normal does of Levemir?
when and how often dose she take levemir?
She will have to check her BG more often and watch out for Hypos (low BG).
make sure she always has her test kit and a fast acting carb (IE reg sugar soda, orange juice, glucose tabs...) to raise BG with her.
Thanks for using the forum.
Have your friend keep careful track of her sugar to make sure that it does not go to low. If she starts to notice low sugars she should call her doctor.
Cathy