She begins yelling at the poor girl. Keep in mind this girl and Karen are still like 30 feet (9m) away so Karen is LITERALLY yelling. Karen is mainly giving a box soap lecture on how this girl is endangering the community and Karen’s kids for not following self-quarantine orders when she OBVIOUSLY has the virus.
She of course calls the employee monitoring the door over who sends out the manager (we all know Karen wouldve called for the manager eventually am i right?)