Targetting involves rewarding the pup for touching a "target", which can be a stick or a ruler or your hand…..whatever you like. Easily taught with a clicker and can be taught without. Then you can invoke "target" while holding the object.....stick, ruler, hand.....where you want the pup's nose to be. Reward when she touches the target. You can then use it to indicate where you want her to walk.
Yes, do try to walk up to her frequently just to pat or reward her, or give her a nice massage, so that she associates your approach with good things, not just going outside which she currently finds unpleasant. Sometimes, take her right to the door as if you are going out, but then just treat or pet her and release her. (with hard to catch horses, it's wise to catch them just to give a treat, then release them. So they never know when it is work or just a treat) Of course, call her to you but not if you think she isn't going to come because she doesn't want to go out. You don't want to mess up your recall this way.
I am going to respectfully disagree with Tanza about restraint. I know many on this board don't agree with it. Certainly there are other things you can try instead......distraction is good if it works, ignoring is good if it works......but bottom line, it is unacceptable for a pup to nip and if she doesn't learn this while she is young it can turn into a biting dog later on. Her litter mates would bite her back, but of course you don't want to hurt her, only teach her that nipping has an undesirable result, be that being ignored or being restrained. When she ceases the undesirable behaviour, the fun comes back. I find some pups/dogs get so carried away playing, they get rough and need some sort of "time out" to settle down and become reasonable again. (if it sounds like little kids, yeah, it is. As with young children, you sometimes just need to remove them from the situation and keep them quiet until they regain control of themselves) It goes without saying that nothing rewarding should ever come from nipping or biting. Reward the calm behaviour you desire.