Do u allow your helper to use the house wifi? My helper has requested for it and said she will only use it at night but I'm afraid she will also use it during the day.

You can allow her to use wifi only at certain allowed time. You can do that by configuring your router with password that will allow connection only at certain hours (or mac address if you have techie hubby ;)). Its a little bit techie but you can ask your hubbie if he is familiar