Aspirin's fine, yeah. Just be careful about giving her too much at her age and weight. Make sure you follow the directions on the label.
It's hard to say without examining her injury myself. Is the area around her elbow swollen? If it is, try using some of that snow to ice it throughout the day. Wrap the snow up in some cloth, nothing direct against the skin. You've got it right with the sling, so that's good. She should also try to elevate the arm while she's resting. Prop it up on her pack. Try to get it above her head, in general.
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It's hard to say without examining her injury myself. Is the area around her elbow swollen? If it is, try using some of that snow to ice it throughout the day. Wrap the snow up in some cloth, nothing direct against the skin. You've got it right with the sling, so that's good. She should also try to elevate the arm while she's resting. Prop it up on her pack. Try to get it above her head, in general.