You can't do that through Koodo - it's either on or you need to purchase a complete data block. There might be apps that do that, but she'd probably just uninstall it... Or just wifi instead.

Just data? Not entirely sure. But you can lock out device access on your child's device. Is this android or iPhone?

Here is a link for google:

https://support.google.com/families/answer/7103340?hl=en

My data has been paused but I updated my plan 

Restart your phone 

i have data 9 GB Left but every time that I try and use It [No Network Conection] , and I do not have WI FI so I can,t use that to make my data work what should I do?

Restart your phone.

If it didn't work, can you start your own post?

https://community.koodomobile.com/topic/new

Add some information, please. Like what kind of  phone you have, did you change your lab recently, was your data working before...etc.