In the comics, the Avengers' fate is complex. Sometimes characters appear to die but are later revived through various plot devices or storylines. It's not a straightforward yes or no.
In the end, Fan Xian did not really die. Fan Xian was stabbed by Yan Bingyun at the end of " Celebrating Years." His injuries were serious, but he did not die. In reality, this was a plan to avoid the Second Prince's pursuit. Fan Xian used the method of avoiding Qi and successfully avoided fatal injuries. Reinforcements came to rescue him. Thus, Fan Xian did not really die in the end.
Well, without knowing the exact true story in question, it's hard to say for sure. But generally, in a true story, the events are supposed to be based on reality. So if the story is presented as such and claims that the girl died, it has a high likelihood of being true. There could be cases where there are false reports within what is claimed to be a true story, but that would be the exception rather than the rule. In most cases, when it comes to a true story, the facts, including a girl's death, are as presented.
Well, it's possible that the girl did die. But without knowing more about the story, it's difficult to give a definite answer. Maybe there were factors that led to her demise, or it could have been a misunderstanding.