Stroke in children

You are in the role of a medical student and you look after your younger sister Markétka on the playground. Markétka plays with her friends on the climbing frames. After some time, Markétka's friends call you. Something is wrong with Markétka. She has a headache, appears confused, has a drooping left corner of her lips and cannot stand properly on her left leg.

What are you going to do?
8
years
130
cm
30
kg
woman
Examination
Epidemiological anamnesis: st.p. COVID-19 6 weeks ago, mild course, otherwise healthy, properly vaccinated according to the calendar.
Family history: parents and siblings healthy, paternal grandmother st.p. massive pulmonary embolism 6/2021 at the age of 71.