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Baldur’s Gate 3is a rich game with plenty of branching paths that characters can go down. This allows for the fates of both your playable character and your companions to drastically change based on your choices in the game.
There are ten different companions available, with one of them being Jaheira who you meet in Act Two at theLast Light Inn. She is one of the few returning companions from the previous Baldur’s Gate games, the half-elf druid being recruitable at the end of Act Two with a lot of plot available in Act Three. Jaheira has multiple endings, some grim, some happy.

Last Light Inn Falls
In theShadow-Cursed Lands,Jaheira and her Harpers make camp at the Last Light Innwhere they are protected from theShadow Cursehaunting the land. If someone wanders into the darkness without light or protection, the shadows will claim them.
The Last Light Inn is protected by a sphere of protection granted by theCleric of Selûne Isobel. However, if she dies, the protection around Light Last Inn will vanish as the Shadow Cursed creeps in to infect everyone inside.

AFlaming Fist traitor named Marcuswill arrive when you talk to Isobel as she blesses you with more protection from the Shadow Curse. If you choose to side with Marcus and help him kidnap Isobel, you will have tofight the Harpers - including Jaheira and have to end her story there.
Alternatively, in theGauntlet Of Shar, you will eventually come across theNightsongat the very end being held prisoner. You have the option to free her and the Nightsong will assist you in the assault on Ketheric Thorn - or you can kill her (if Shadowheart does this she will become a Dark Justiciar).

If you choose to kill the Nightsong, the protective sphere around Last Light Inn will be destroyed and the Shadow Curse will overtake it - withJaheira dying off-screen in the process.
Solemn Retirement
In Act Three, Jaheira’s companion quest has you helping her track downher old friendMinsc(the other returning companion from previous Baldur’s Gate games). As it turns out,Minsc has beeninfected by a Mind Flayer tadpoleand is being fooled into doing theAbsolute’sbidding thanks to animposter Jaheirawhom he takes orders from.
Upon finding Minsc and the imposter Jaheira, the imposter convinces Minsc that the real Jaheira is the enemy and will lead to a fight between their group and your party. You are required to take out everyone in the fight - but in order to recruit Minsc and complete Jaheira’s plan you have tohit Minsc with a non-lethal attackor else he will perish and no longer be recruitable.

If Minsc is killed in the fight, Jaheira expresses extreme sadness in having to take down one of her own friends. She tells you that she willtake Minsc’s body back to his home in Rashemenandthat she has gone as far as she can, saying she is done with Baldur’s Gate, and it is done with her and willpermanently leave your party.
Taken By The Urge
This ending is only available if you play as the Dark Urge Origin Character.
The Dark Urgehas two different paths it can take. you’re able to either resist the Urge and reject Bhaal, or fully give in to it. After slayingOrin in the Temple of Bhaal, you have the choice to either let yourself die orbecome Bhaal’s chosenand become the puppet for the God of Murder.
If you opt to become Bhaal’s chosen,Jaheira (and Minsc) will permanently leave your party. If they are in your party when you make your choice, they will leave the room and wait for you outside (or be waiting outside if they are not).
Upon leaving the chambers, Jaheira will tell you how she stopped a Bhaalspawn before (a reference to prior Baldur’s Gate games) and will do it again and attack you - leading to afight where you will have to defeat her to progress.
Taking Down The Elder Brain
Jaheira’s good ending comes if youcomplete her questlinein Act Three to save Minsc and you donot kill the Nightsongorbetray her by helping Marcus kidnap Isobel. Jaheira will remain in your party and will be with you in the final fight.
She will allow you to summon Harpers during the last fight of the game and be able to fight alongside you as a companion. She does not have any special ending cutscenes after you defeat the final boss, but will survive the conflict with her mission accomplished.