
Your dog is still a pup... I really wouldn't get worried and worked up about it! I don't feel you can be impatient with her just yet! They go through so many phases, hormones raging, growing up, but still being a pup... It's not easy for the dog either.
I found that although my spaniel was house trained by about 6 months, he had a couple of relapsed until he was 11 months old and has been rock solid since then!
The chewing is again something perfectly normal at her age! Give her plenty to do, lots of stuff she can chew etc. and it will be kept to a minimum! Don't forget, she is probably also going through her second teething stage as her molars are starting to settle in, which will make them chew more again...!
You might also want to look at her diet... has she eat different foods over the last three days? Could she even have a urinary infection? Has anything in the environment changed? New people, building works, new routines etc.
But in the main, she is a baby still, give her time and a chance to grow up! :-)
Vera