Tekla Badarzewska is a Polish composer, we know very little of her. Considering some sources, she had lived from 1838 to 1862, composing in 1856 a medium difficulty song for piano called Modlitwa dziewicy, better known as La prière d’une vierge (The prayer of a virgin). Probably it is one of the most played pieces on piano, especially in Poland. I invite you listen and if you are able to play this song.
Here’s the free sheet music Modlitwa dziewicy (La priere d’una vierge, in en The maiden’s prayer) : Download it here