If you have had her for only a week she is still adjusting and may be using the wheel heavily to deal with the stress of the situation. Taking a wheel away from a stressed hedgehog can cause them to develop other bad habits, like climbing cage walls for example. I wouldn't keep her wheel away from her all night, she needs it not only for physical well being, but it seems to help a lot with stressed out hogs mental well being too.
Lets start with a few basics....:
How is her weight doing? If you aren't already, start weighing her routinely. If she really isn't eating/drinking she will be dropping weight.
Are you feeding the same food as the breeder? Even adult hedgehogs will sometimes go into a starvation mode when you drastically change their diet. If you can make sure you have some of what they were eating before and over a period of 3-4 weeks change it out. I
Why do you think she's not eating? Are you counting kibble? Watching her constantly? Weighing food? If you are always watching over her, back off, give her some space to settle in. If you are counting kibble or weighing food, go back to the paragraph above.