Advice for lab pup who won't finish chews

Our little girl is 20 weeks old and in the throws of teething. She's doing good for the most part, not chewing furniture or wires. She really doesn't like inedible chews, like nylabone or benebone, so bully sticks and collagen chews are the name of the game. However, almost without fail, she seems to only finish half of each one, and then lose interest. And it's not just a "lose interest for the day". Even if I put it up in the cabinet for a few days and then offer it to her, she knows and turns her nose up at it.

Any advice how to encourage her to finish her edible chews? Is it just a teething thing?