A researcher designs a study with the goal of solving a particular problem in her field. What type of research is this?

The type of research being conducted in this scenario is applied research.

Applied research involves the application of scientific knowledge and methods to solve specific practical problems and address real-world issues. It aims to bridge the gap between theory and practice by providing practical solutions and insights that can be immediately helpful in addressing specific problems or improving existing situations.

In the given scenario, the researcher's primary goal is to solve a particular problem in her field. This suggests that she is conducting research with the intention of directly solving a specific practical issue or contributing to the development of practical solutions, making it an example of applied research.