If you keep the wifi change the password. Then your kids can have access to internet for homework and you can cut her off. Make sure you sign the kids on and off so she can't use the internet of the computer.
M:34 XW:34 Together: 10y Living: 9y Married: 7y Son:6 Son:4 Separated: 12/28/13 Piecing: 5/2/14 Separated 2nd: 10/16/14 W filed, but pulled it: 11/5/14 papers served: 1/27/15 D final: 3/6/15