Alice's visions are subjective. She can only see the future of species that she knows. She can see humans because she was one, she can see vampires because she is one, but a werewolf she has never been, making it impossible for her to see the future of Jacob. Like in eclipse, when Alice was supposed to keep watch over Bella, making sure she doesn't go somewhere with Jacob, even though she couldn't see what Jacob was going to do, she knew when Bella was making a decision to go with Jacob because then Bella would be with Jacob, therefore being clouded from her sight. No, they are not blurry, they are completely invisible.
Renesmee is also a species completely knew to the world, not to mention Alice. Alice has never had exposure to that, so she could never see Renesmee. It didn't change when Renesmee grew up, because she would always be the same species. And it doesn't help that Jacob will be with her all the time too.
So in conclusion, Alice can neither see Jacob or Renesmee, as long as they both live.