How to hide my Wifi password?

[justme_rai]

Ok we have only the Admin account. i dont want to set up a guest account or any other account coz there are some issues.

But the problem is that my laptop connects to my wifi and when you select the connection properties anyone who uses the laptop can see the password and use is with other devices. is there a way i can hide that password without creating a seperate user account on my lappy?

i just dont want my niece to get hold of the password which she has done twice already coz she uses up all my data.

please help
Kyll: Its on a 4G network. we have a certain amount of data that i get a month and she just downloads movies and music and tv show on her mobile and ipad and uses all my data up.

creating a separate user account for her is difficult coz i have issues my lappy cant creat user accounts for some reason.