Because… she did nothing wrong?
I mean, if anyone, Genn was the one in the Pyramid with Rastakhan
In both version, the biased Zandalari survivor’s story (who probbaly wasn’t even there, since you know, he is alive…) and the “true” version, when the alliance strike team was there to do the deed
Anyhow, in both version Jaina wasn’t even inside the Pyramid and the throne room
The Alliance strike team not even killed Rastahan! Wounded him, yes, but for someone who was killed by the mean Alliance, he was quite chatty. No. He was alive when his priest daughter arrived and had a nice mournfull monolgue and passed the Bwonsamdi deal to her
You know who is responsible for Rastakhan’s death?
Bwonsamdi
" King Rastakhan yells: Bwonsamdi! De Alliance invaders have struck down our people! Aid me!
Bwonsamdi yells: Watch be raisin’ such a fuss about, ya majesty? Ol’ Bwonsamdi ain’t gonna let no outsiders take your throne!"
But after that?
King Rastakhan yells: Bwonsamdi! You are my loa! Honor our bargain and strike down dese attackers!
Bwonsamdi yells: Ya be mighty demandin’, Rastakhan! I gonna give ya de power ya seek… but ya watch your tone.
Then finally?
King Rastakhan yells: Why are dese invaders still resisting? You should have dealt with them by now, Bwonsamdi!
Bwonsamdi yells: Ya been king a long time, Rastakhan. Maybe… too long. If ya can’t be gettin’ da job done, perhaps dat pretty daughter of yours can.
And
King Rastakhan yells: No… de darkness… it is too much to control!
King Rastakhan yells: Dis darkness threatens to consume my soul! I must… be free of it!
King Rastakhan yells: Dis power… dis death… it is a curse, not a blessing! Oh daughter… what have I done?
Bwonsamedi gave him a power that was a curse, that consumed him from inside, and the Loa of Death waited for a long time to have the King’s soul!
The wounded King was living on a borrowed time, but even without godlike or Anduin level of powers (and Talanji is a capable Priest mind you!) they have every tool to save him
Except their Death God , who tricked him, and probbaly prevented any healing spell to be effective (seen that trick before, when he was stabbed and the Horde hero had to bargain to save the King, no matter how powerfull or ancient spells and methods were used)
No my boy, Rastakhan was betrayed by Bwonsamdi who even gloated, how his dauther will be a more fitting business partner
I repeat: Jaina wasn’t even in the Pyramid when he was “killed” (but got better to say bye to his lil girl)