My Kindle 3G seems to have frozen. - Amazon Kindle 3G

Restart Your Kindle Paperwhite. Many issues with your Kindle, such as a frozen screen or issues with downloading content, can be solved by restarting your device. Help for Kindle Paperwhite (5th Generation). Press and hold the Power button for seven seconds until the Power dialogue box appears, and then tap Restart.

Amazon.co.uk Help: Quick Fix: Restart Your Kindle Paperwhite

https://www.amazon.co.uk/gp/help/customer/display.html?nodeId=201176080..
or go to this link might help you out... Kindle paperwhite won respond to Swipe to unlock Kindle Google Search

3G on my Kindle does not seem to be working How do fix it Google Search ..try this link

Reset the Kindle

Many issues with your Kindle, such as a frozen screen or issues with downloading content, can be solved by restarting your device.

1. Press and hold the Power button for a full 40 seconds. After the first 6 to 8 seconds, the screen will go blank, which is normal. ...
2. After the 40 seconds, release the Power button.

Has she tried holding the power button for 20 seconds then letting go? Kindle will normally restart. If not, contact Amazon.

Did you try

Instructions

1. Frozen Screen or Unresponsive Kindle
   • 1 Unplug the Kindle.
     
   • 2 Move the power button to the right and release. You should see a green LED light for two seconds.
     
   • 3 Move the power button to the right and hold for five seconds. The green light should blink three times and then the screen will go blank. Release the power button after it does.
     
   • 4 Turn the device back on by sliding the power button to the right and releasing it.
     
   Perform a Hard Reset
   • 5 Perform a hard reset if the previous steps are unsuccessful or if the Kindle screen is showing lines.
     
   • 6 Slide the power button to the right.
     
   • 7 Hold for 15 seconds.
     
   • 8 Recharge the battery if the device continues to be unresponsive.
     
   • 9 Restart the Kindle after charging.
     

Read more : http://www.ehow.com/how_7655306_reset-kindle-3g.html

did you try the reset button ,it a very small hole that you can stick a pencil en ,try that if not go in and do a complete reset to factory .This is done by going under privacy

First of all there are two types of kindle, the kindle 3g + WIFI and the Kindle WIFI. If you bought the kindle WIFI you will be unable to connect to a 3g network. If you bought a 3g model you can access 3g internet by pressing the 'menu' button and then using the 5-way to navigate to 'turn on wireless'. Once wireless is on you can access your browser by clicking menu, scrolling to experimental and then selecting Web Browser
Cheers Sine Wave

Amazon might help you with this because it is so new. However if you dropped it (etc.) and if HTC doesn't replace it for you, You can get the part at Kindle 3 Repair and there is a guide that shows you how to put in the part at Kindle Repair Guide.

Hello.

Reset your Kindle.

There's a little hole inside the battery cover area. Put in a pin or paperclip end and press. The Kindle should unlock.

Hope this helps.