In my experience (as an IT Tech) kids will do what kids will do and if something pops up on the screen telling them they've won the lottery, they'll click on it, or if they visit some dodgy website and see "free download" they'll click on it. The only thing you can do is get an all round program like Norton Internet Security and try to set it up to automatically update whenever the laptop is online. You say that this is for her to keep in touch with her family, but you know that chatting on yahoo, sending emails or using Skype is not likely to cause any problems, it's the other things it will be used for that's likely to get it screwed up.
Check out how to set up remote assistance here. http://www.windowsnetworking.com/art.../wxprmass.html
Iain.