when I was a lad I owned a BSA cadet 177,in the barracks where I lived my bedroom overlooked the sports ground which in the far corner had a pavilion with a galvanised steel roof,this was around 300yds from my window and I could hit this using the cadet,I could not pick a spot but by applying loads of elevation I could hear the pellet strike the galvanised roof,mind you in the time it took to reach this hut I could make serious inroads into War and Peace,we also used to make bombs from lengths of old tv ariel and weedkiller and sugar but thats another story.
Back to the topic of long distance shooting I say well done that lady I am going to have a go with my career when the weather is warm enough for my old bones