A Schengen visa decision can be appealed by the applicant, or by another person if the applicant has authorized that person to speak on her behalf (this is done by a written power of attorney).
This is an example of a power of attorney.
An appeal shall arrive at the Embassy within 21 days after receiving the decision. Due to GDPR regulations, the Embassy recommends sending appeals by mail (however, appeals received by email will also be accepted). Submission of appeals at the Embassy takes place on Tuesdays and Thursdays at 2pm to 3pm only. Please note that no original documents of value shall be submitted with the appeal and that all documents must be in French, English or Swedish.
The appeal shall mention the following points:
The Embassy will examine whether there is a need to modify the decision. If no change is made, the case will be sent to the Administrative Court in Luleå, Sweden. The Administrative Court is responsible for notifying the applicant of their decision.