I checked my toddlers ipad browsing history and saw 100 of pages of porn! The only person who has access to it is my maid - what should I do?

Definitely talk to her upfront about it. Listen to what she has to say, and then respond with your views. If she is truly contrite and assures you that she won't do it again, and you're still comfortable with her taking care of your kid, then you may want to give her a second chance. Otherwise, you may have to let her go.