They need to chew especially as they lose their baby teeth and are breaking in the new big chompers. Personally I love anything from the Kong line of dog toys but especially the classic snowman shaped Kong. You can put kibble in it or a dab of peanut butter around the edge to encourage her to want to chew her Kong over other stuff. Other than that of course is just policing the house for chewable stuff.

Bella our lab is 2 now and still not at all trustworthy with anything from the Nerf line of toys or the small plastic figurines that Mikey loves (Star Wars type things). We've just learned to keep that stuff away from her because she can't seem to help herself. She never chews anything but those things and of course her Kong. She's a big time chewer, Christie, and that Kong has got to be a good 18 months since we bought it but she can't chew it up. Well worth the higher price of that dog toy line as Bella can chew up a cheaper toy in a single afternoon.

If she's after furniture corners and so forth try one of the natural product chew repellants. Bitter Yuck comes to mind.