I totally agree with foxywench! We got Boss when he was just 5wks (unknowingly on the part of my bf) and we had the hardest time getting to sleep at night. He would wake up at (just like Gidget) 3am and want to play. Well, I finally did the bad thing and started putting him in bed with us where he would sleep just fine all night. He sleeps with me full time now, but when he wants to play and I want to sleep I put him in a crate and just ignore him. It's the only way he'll learn...even though it makes me feel awful lol.
Also, someone on here told me to this (sorry I can't remember who lol), get a hotwater bottle and put it under her blanket (I wrapped it in a hand towel and then put it under his blanket so he couldn't chew on it) to keep her warmer. A ticking alarm clock is good too cause it makes them think they're sleeping with someone else (sounds like a heart beat). If she is just 7wks then it might help her sleep a little longer during the night, I know that it helped with Boss before my bf moved out and I started letting him sleep with me.
Hope that helped
Edit: I didn't know someone else mentioned a hot water bottle