Lethargic, stressed baby

[Lilypad]

I got my little Marnie on Monday, only five days ago. The first night she was home, she ran on her wheel for hours and seemed very energetic. Same for the second. But now she seems very lethargic. She doesn't wake up until after I'm asleep - midnight or later, and she's in bed again once I wake up - usually about 7. I have to wake her up to bond with her or I'd never get to see her. I try to do it later, when at least she's had some sleep.
The third day we had her, she had diarrhea but she only had it once and I assumed it was stress. Tonight she had green poop.
She's been very active, but tonight I pulled her out to bond with her and she just sat on me. I definitely thought she was more of an explorer than a cuddler.
Her wheel is always covered in poop in the morning, so I do know that's she's still running on that. She's eating less than I'd like, but she's still eating.
Her cage is constantly between 75 and 77 degrees.
Is she okay? I'm so worried. Is this just stress and I'm overreacting? Do I take her to a vet? Please help. Thank you!
Oh, also she's about three months old. Her birthday is on September 10, 2015.

[Lilypad]

She's on a regular light schedule, though I could be more punctual. The breeder said that she "just went by natural light" there, but I didn't think that was a good idea since we only get about six hours of light a day here. There's light from 7am to 9pm. She was a little itchy yesterday, but not too much. Just a few scratches while we were playing.

[Draenog]

Sounds normal to me, the first days she might have been a little stressed and therefore more active. It's quite normal to have to wake up your hedgehog in order to see it, esp when they are young. Babies sleep a lot. Some don't come out as long as there is any light in the room, even a small lamp. Since she's active, running and eating it doesn't sound like something to worry about. As with all new pets keep an eye on her of course, but give her a couple of weeks to adjust and develop her sleep/wake schedule.

[Lilypad]

Okay, thank you so much Draenog!