Just make sure whatever you tell her its age appropriate. Because it can backfire, self exploration is normal but reenacting adult relations is dangerous, and it can often happen when children are given way more information than is needed. The opposite side of that is instilling fear when not meaning too, sometimes too much detail can frighten children as well. There are some great books and information about. I know our school uses independent counsellors who deal with teaching children about sexual education when we have sex ed classes, which IMO is fantastic. The information is always age appropriate but even the follow on information is age appropriate when a simple answer is not enough. Its a tough subject but we are lucky to have so many resources at hand. Contact relationships australia and they might be able to source some information for you.