To clarify, the "engine" she created is not actually an "engine"; it's unrelated to what you assume to be a propulsion system. It's a mechanism designed to reduce carbon emissions through a pressure-based condensation system. If you're still in high school and find this intriguing, I recommend studying mechanical engineering at the undergraduate level, followed by a postgraduate degree in Aerospace Propulsion. This path could lead you to develop similar technologies for your thesis.
The advancements in high-tech research are astounding, yet often, little comes to fruition due to various challenges such as integration, cost, and certification. If these topics intrigue you, consider a career in systems engineering or process engineering. In the future, you could return to this forum to share your expert insights. For the moment, focus on preparing for your GCEs and SATs.
Good day.