To be completely honest, I can't say for sure she lied 100% about the train incident. However, it was very suspicious as she was under constant attack from pretty much everyone, and when she revealed she received no sympathy, because people immediately thought she was making it up or blowing it out of proportion due to the drama she was facing. She was fishing for some pity. And the general answer was confronting her with screenshots of her problematic behavior. She never mentioned this again, or any other situation that could be similar to this, so it's likely she was either lying or twisting some truth into something that was not entirely real.
And if it was real, nobody took sympathy on her, which is actually kinda sad.