Hmm, yes, there is an issue there. Put the domain of these forums into your hosts directory as I explained abouve which will mean any material from those domains will not be downloaded. This is a bonus because not many people are aware of this way of blocking and you won't need a program which leeches off the RAM and cpu (I'm a system resources miser). If you don't tell her what's going on there's a 0% chance she'll figure it out.
Next, I suggest you explain to her to never give her full name, address or phone number to anyone online. Don't just tell her to, make her see your point of view, educate her about the risks and convince her not to and you won't need to censor her in future.