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Once in the forest head south and click on the foot prints. Then head east and click the flowers with the stars. Then head north east and click on the stars in front of rocks then head west and click on the foot prints(there is some treasure here if you want to try to find it). Sleep.'
All I can suggest is to keep looking and checking every nook and cranny. At the end of the day you don't find Lara, she'll get brought back later by the guards.
Another thing, if you don't continue to train Lara until she ends up sucking Vruk's cock, then Lara will leave and go live with the Dire Wolf, and I think that'll be the end of her story with Vruk.