How much time do you spend training and playing with her each day? Are you making sure she has enough mental stimulation?
I have had a few fosters who were chronic chewers when they came to me, and I found that the easiest way to solve it was to make sure they were tired out mentally and physically, not the the point of exhaustion, obviously, but so that they are not bored.
The in between times they would happily lie down and chew a toy - rope toys usually worked best for the chewers, and I would put them in the fridge beforehand for the teething pups, but always have some out, chilled and ready, scattered about the house so a sort of constant rotation iyswim.
If they did then go for the furniture, I would say "no, that`s not yours" in a firm but calm, kind and patient voice (using the sort of voice you would to give toddlers guidance, iyswim absolutely not shouting, raising voice or sounding stressed or angry) and then I would hand them a toy and say "this is yours, this is your toy".
As soon as they started chewing the toy "yes! Well done! Yes! thats your toy" enthusiastically praising them. I dont clicker train, but I use "yes" as a marker, so same principle, and I have found that using "yes works brilliantly, and really speeds up how quickly they catch on.
I also teach "get a toy" as one of the first things with a new pup or foster, its easy to teach and in my experience helps bypass a multitude of problems, can`t munch a foot or table leg in passing if their mouth is already occupied! 