die Mitarbeiterin
female employee
A female person who is employed by and works in a company, public authority, or organization.
Die neue Mitarbeiterin wird heute dem Team vorgestellt.
The new female employee will be introduced to the team today.

female employee
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female employee
A female person who is employed by and works in a company, public authority, or organization.
Die neue Mitarbeiterin wird heute dem Team vorgestellt.
The new female employee will be introduced to the team today.

The word consists of the prefix 'mit-' (together), the verb 'arbeiten' (to work), and the feminine ending '-in'. So a 'Mitarbeiterin' (female employee) is literally a person who 'mitarbeitet' (works along/contributes).
Unsere Abteilung sucht eine neue Mitarbeiterin für das Projektmanagement.
Our department is looking for a new female employee for project management.
'Mitarbeiterin' (female employee) belongs to the word family around the verb 'mitarbeiten' (to collaborate/contribute). The activity itself is called 'die Mitarbeit' (collaboration/contribution), and the masculine form is 'der Mitarbeiter' (male employee).
Die gute Mitarbeit aller im Team führte zum Erfolg des Projekts.
The good collaboration of everyone on the team led to the project's success.
In a professional context, the word is often used with verbs such as 'einstellen' (to hire), 'suchen' (to look for), 'schulen' (to train), or 'entlassen' (to dismiss/lay off).
Das Unternehmen musste leider einige Mitarbeiterinnen entlassen.
Unfortunately, the company had to lay off several female employees.
staff
'das Personal' and 'die Mitarbeiterin' both belong to the area of work and business. 'Personal' means several or all employees of an organization. 'Mitarbeiterin' means one individual female person who works there. The words can be confused when talking generally about people in a company. But you do not say 'eine Personal' when you mean one person. For that, you use 'eine Mitarbeiterin'. When you mean the whole group, 'das Personal' is appropriate.

Am Empfang erklärte mir eine Mitarbeiterin den nächsten Termin.
At reception, a female employee explained the next appointment to me.
Nach dem Gespräch wusste ich, dass das Personal in dieser Praxis gut organisiert ist.
After the conversation, I knew that the staff at this practice was well organized.