(1) If Brenda 'watches' the kids the way we think she does, Danielle could have had everyone on the planet in their house and Brenda wouldn't have known about it.
According to the neighbors, none of them KNEW the VD's closely, or let their kids play there.
Only one neighbor had a daughter that Danielle played with and that slept over. (the other neighbors probably didn't like the POT/COCAINE/EXSTACY/ and ORGIES in the GARAGE while their KIDS were around idea!)
SO, It would be real hard to tell if Danielle had LOTS OF FRIENDS over or not. (Maybe lots of UNWANTED/over 30 year old friends of her DAD's).