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I forgot to go back for Lae'zel, is it too late?
(sh.itjust.works)
Baldur’s Gate 3 is a story-rich, party-based RPG set in the universe of Dungeons & Dragons, where your choices shape a tale of fellowship and betrayal, survival and sacrifice, and the lure of absolute power. (Website)
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You have another chance to get her just before entering Act 2 if you head to the Mountain Pass. If you enter Act 2 without her, she is gone forever.
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You can actually come back for her during act 2 too. If you move on to act 3 then it's too late. There are two different ways to get to the mountain pass. She's at the top route. Be ready for a fight. ;)
Edit: there's a big fight in act 2 that is possibly the point of no return for going back. They tell you that it will have several effects on the world before you start it.