Alice should call an electrician to repair or replace the switch.
Doing this can help prevent Alice, or someone else from getting severely shocked which can be fatal. Or in many cases, prevent the house from catching on fire which can help prevent the life of loss and protect you house. So that being said, Alice should call an electrician right away to check the wiring, and even repair or replace the switch.
I hope this helps!
-LizzyIsTheQueen