where did you use your bones? if you can get the pup it means that you have at least huldra3. make sure that you have all the 3 potions for the fight, and that you have more than 10 medkits. the guy with the gun is useful only if you have the skill firearm3
you need to have solvent and chemical in your bag before the fight start or else she will be stronger. also make sure that you have rations so that your defender can block her strong attack. then use the order lacerate->firearms->regroup->tagteam->trueshot->defend. if you still cant win it means that you didnt finish enough missions in alfheimr and your stats are too low.