Dogs are still classed as puppies until, I believe their 2nd birthday. There are several things you can do to help with her naughty behaviour.
1 - Depending on what she is chewing, either make sure nothing is left on the floor, or if it's furniture, etc. spray everything with a fine mist of water, then use a brush & dust with pepper. She will hate the taste & is less expensive than the anti chew sprays you can buy.
2 - If she's chewing while you are out, leave her in one room only, preferably where she can do the least damage, or a crate. Again, spray every thing in site as above. Leave her with her bed & something that smells of you (an old jumper etc.) that you no longer want, but have worn.
3 - Get a squirty bottle filled with 95% water/5% vinegar. Again, as with the pepper, it won't do her any harm, but she will hate the smell. As soon as you see her chewing/digging squirt her with the spray & state firmly, but calmly NO. The smell will distract her while you correct her.
4 - Whenever she does something right, like leaving something alone that you have left out, reward her with a treat & a fuss.
5 - Exercise her before you leave her. Sounds impossible? Get a bike/skates & run her flat out round the block a few times until she can't run any more. If she's running flat out, shouldn't take any more than about 10 mins. She'll get used to running along side you very quickly & will really enjoy it. Once you get her home shut her in the room/crate with the blanket & something of yours & then just leave. She'll be so tired, she'll sleep till you come home.
All the above worked on our 10mth boxer/staff cross, who chewed everything & anything, especially while we were out. She dug that many holes am sure she was half way to Australia & my plants were strewn all over the garden. The spray stopped the digging, the pepper & exercise solution stopped the chewing. We also have a 3yr staff who never chewed/dug up anything, but it made no difference to Chloe's behaviour, until we tried the above.