This is the 17768th most frequent Russian word.
улучшала
"Улучшала" is the feminine past tense form of the verb "улучшать," meaning "improved" or "was improving."
In this sentence, 'улучшала' is used to describe the progressive action of improving language skills over a period of time.
Она улучшала свои языковые навыки каждый день.
She was improving her language skills every day.
Here, 'улучшала' indicates a technological improvement that was contributing to better image quality.
Эта технология улучшала качество изображения на экране.
This technology was improving the image quality on the screen.
In this context, 'улучшала' is applied to the personal action of adopting habits for health improvement.