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.

I do not see any problem in her using the house wifi, (if it has an unlimited data plan) as long as she is not letting her work suffer. The best thing you can do, if you are allowing her to use wifi, make her sit and tell her that you do not mind her using the wifi, as long a she abides certain directions that you give her. For instance, if you want her to use Internet during particular hours, you can convey this to her that she can use it at night or for 3 hours a day.