If your imaginary French friend says she has "la flemme," it means she is feeling lazy or lacking motivation. It does not indicate that she has any illness or the lurgy.
It is generally safe to be near someone who feels lazy or unmotivated, as it is not contagious. However, during the ongoing COVID-19 pandemic, it is important to follow health guidelines and maintain social distancing.
Sharing a cup or straw with someone, even if they are not ill, can still pose a risk of transmitting germs. It is advisable to avoid sharing personal items like cups and straws to minimize the spread of infections.