Hi,

chewing can get very annoying, i know! I also think that some exercise could help a lot. Do you take her out for longer walks? That would be a good idea anyway because usually dogs like getting tired from outside experiences - there is so much to smell outside, they can run and jump there and play ...
A tired dog is much less likely to chew on something.
You say you are home a lot - try to observe her and as soon as you find her chewing on something she is not allowed to, take it away and say a strong "no". But this only makes sense when you really interrupt her, some time after she already has ruined it, makes no sense, because she would not know what you are referring to.
When you play with her, after you were walking her and she is tired already, she can chew her stuff, and that is good, but then she will be even more tired and chewing should not be of any interest for her any more.
I hope this helps!
All the best
Michael