Intentionally feeding troll

I was in a normal game today, and I came across this troll, who flamed us and started intentionally feeding after she forgot smite, and when Kog'Maw accidentally stole her blue buff. If you look at the kill map on my match history, it shows that Elise was purposefully diving the tower and just let herself be killed. Most, if not all of her deaths are in the midlane, and since shes was a jg, it just adds to the fact that she was feeding on purpose. If nearly all her deaths are in midlane, its kinda obvious that she was feeding on purpose. Map