Fed ADC farms bot all game

This game was won if the fed vayne left bot lane but, she wanted like 5 or 6 items before we would start team fighting. I was fed as rumble with 4 items at lvl 15 and we could have easily won the game. The enemy team did baron and pushed right down mid and we could not stop them from doing it because it was a 4v5 and their viktor was too strong <.<

it did not matter if it was a baron or and inhib that was lost she just kept farming bot lane

we ended up losing the game without my team ever fully grouping once because everyone was telling her to group, even her support. I hate wasting 30 minutes on a game when I know I will lose.