Answer:
As the question does not provide any context about who Jane is and what she has done, I cannot provide a specific answer about which core business etiquette is missing in Jane. However, in general, some of the key core business etiquettes that are important to follow in a professional setting include:
Punctuality: Arriving on time for meetings and appointments is a sign of respect for others and their time.
Professionalism: Maintaining a professional demeanor, dressing appropriately, and using appropriate language and tone of voice are important in projecting a positive image and establishing credibility.
Communication: Effective communication skills such as active listening, clear speaking, and appropriate use of technology are essential for building relationships and achieving business goals.
Respect: Treating others with respect, including acknowledging their opinions and perspectives, is key to building positive relationships and fostering a positive work environment.
Business etiquette: Familiarity with and adherence to appropriate business etiquette, such as proper introductions, handshakes, and business card exchanges, can help establish a positive first impression and build relationships.
It is important to note that specific business etiquettes may vary depending on the cultural and social norms of the particular workplace or industry.