Based on the information provided, Mrs. Chen's correct and most favorable filing status for 2023 would be Head of Household.
To qualify for Head of Household status, a taxpayer must meet the following criteria:
- Unmarried: Mrs. Chen is considered unmarried for tax purposes because her husband left on February 14 and she has not seen him since.
- Maintaining a home: She provided more than half the cost of maintaining a home for herself and her qualifying child (her son, who is 11 years old and meets the criteria for a qualifying child dependent).
- Qualifying child: Her son qualifies as a dependent.
Since Mrs. Chen meets all the requirements for Head of Household, it would be the most favorable filing status for her for the tax year 2023.