Penny is an intensely shy person who rarely attends social gatherings. In addition, she normally will not accept dinner invitations and refuses to speak in public, even if it is among a group of friends. Penny MOST likely suffers from disorder

Social anxiety

Explanation:

Social anxiety disorder is defined as the disorder in which a person tends fear from being judged negatively or being rejected for particular social situation.this social phobia causes extreme anxiety and distress to the person and thus, they avoid social gathering-like situation .

According to the question,Penny might be suffering from social anxiety disorder as she keeps rejecting dinner invitation, speaking in public events etc.She might feel anxious due to fear of being negatively evaluated in social gathering by friends and other people .

if you tell me the video, i may be able to answer your question.

you should try adrenaline. it kicks in in situations like this.