6 month old chewing

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Miss Daisy at 6 months old (border colie/lab cross) has taken to chewing the chairs, couch and carpet.
So far I have tried
Saying No - which leads to a standoff with much barking as she seems to think it is now a game.
Distracting her with a bone etc which lasts for 5 mins before she returns to yummy furniture.
Distracting her with a game outside, bit of training practice etc. This lasts as long as I am available. When I return to what I was doing, so does she!
Our house is open plan so we are all in the main rooms together. I have considered if it is a sign of boredon, lack of exercise etc, but today I took her for a huge exciting walk by the river. When we got home she had a short nap then went straight back to the chair...

DH is getting very grumpy and tempers and fabrics all around are getting very frayed. I would be so grateful for any advice.

collie.

Have you got a crate?

What other chew toys have you tried? Have you tried a kong? They are pretty good. My dog also loves her stag bars (a bit of antler!) which is still going strong after about 8 weeks.

Aren't there spray deterrents to help stop chewing? Like the bitter stuff that could be painted on nails to stop nail biting.

(Says I, currently planning a tip run due to vast quantity of half eaten belongings!)

We have a collie and when he was a puppy he chewed the bottom step of the stairs, he took the carpet right off, to be honest he was teething and he has never chewed anything since.
On the other hand we have a rescue foxhound who is a couch chewer! He has physically tried to chew and eat the insides (foam) of the sofa in our living room and family room (they were both old and tired and needed replaced anyway). It has stopped now by taking the following action:

1. making sure there are enough toys around and rotating them so there is something new everyday (we just have a box and get out 2/3 every day for them)
2. We were told to repair the problem areas with tape, sewing and covering (which we did with a throw)
3. Scatter feeding - something to do with his breed but certainly keeps him very busy in the garden
4. Putting the TV on, which he focuses on and therefore doesn't chew

Probably the most frustrating advice - but good anyway was to ignore the behaviour and he will get fed up with it.......and he seems to have done. I certainly feel your pain and if I had a list of things my dogs had chewed over the years it would be very very long!

Thanks everyone. I forgot to say the other option is the crate which I pop her in when she is chewing. I think she often does it when she is tired and feeling naughty - just like the DCs.
Ignore is an interesting and scarey option. I do sense that it is all bound up with my reaction.
I'll try a new round of toys and bring out the Kong again. I do feel that for her nothing beats that satisfying feeling of ripping through fabric, wood and foam!

our last dog was a lab x collie and chewed quite a bit when we first had her. She discovered logs at PILs house, she loved having a rummage through their log pile, then selecting a tasty, slightly musty log to chew for a bit. When it got a bit tired she'd go and get herself a new one :)

It did make lots of mess on the carpet, but stopped her eating other more important stuff (dd1's shoes etc). She never seemed to get splinters, but the firewood was a little damp from outside...

We had a collie cross who was a fanatic chewer.... We had a Kong for her - and would pack it with dog biscuits - if you really go for it you can cram them in very tight and probably block the hole with the final one that you press in - that used to give us up to about 40mins of chewing time. She also had hide 'bone' chews - probably destroyed a big one every other day (cheaper than the furniture). Old pairs of socks or tights knotted tightly together (lots) are also apparently great to chew - and if they work at it they can probably find a rippy piece too - our collied loved it and would work at it for hours!