Boy, I am no expert on this stuff, even though I have personally had dogs do exactly the things you speak of.
About lying down...Rosie did that (my GD) and it was tough...then she'd go inside and piddle on a rug! Maybe spray some of that "potty scent" outside for her...but I'd put her on a leash and every time she lies down, talk to her and say "potty" and pull her to a stand. If she continues, I'd put her back in the crate and try again later. She will eventually get the idea. It took Rosie about a month to figure it out.
The chewing...ugh! We had so much furniture destroyed! We tried bitter apple, we tried hot sauce, we fenced everything off with x-pens...but the best advice we had was to keep her crated unless we could watch her EVERY SECOND! Yeah, right. That is not really practical, but it is good advice. If possible, try tethering her to you.
Good luck! (She WILL outgrow it! Ours did!)