If she wants to go in, let her. If she is hesitant, don't try to force her in. Many dogs learn how to swim by watching other dogs, so having a good role model early is great.
At such an early age, you have to be careful of making her fearful or nervous near the water. If she seems nervous, call her away and redirect her. Don't pet her and say "awe, it's okay girl" if she's nervous because you'll reinforce the behavior.
Just let her do her thing, if she goes in, she goes in. If not, at least her first experience with water will be a positive thing.
At such an early age, you have to be careful of making her fearful or nervous near the water. If she seems nervous, call her away and redirect her. Don't pet her and say "awe, it's okay girl" if she's nervous because you'll reinforce the behavior.
Just let her do her thing, if she goes in, she goes in. If not, at least her first experience with water will be a positive thing.