I feel bad suggesting this, but it did cross my mind.
After a local child murder, all of the parents here were having stranger danger talks with their kids. About a week after the crime, a neighborhood girl, age 9, started a bus stop story that a man had knocked on her door and said "are you home alone?" as soon as my kids told me that story, I called this little girl's parents, as did several other neighborhood parents, and it turns out the girl either "dreamed it" or made it up. I know how horrible it is to doubt childrens stories of abuse or molestation, and being 3 girls and not just one, I do not think it was made up as a reaction to the publicity of the Isabel case, but I sure hope there is tangible evidence of this crime at the scene.
It seems that the parent or grandparent of these girls, seeing the flyers everywhere and the news and the local drama of Isabel's case, would have told the girls to be extra alert, would have the alarm on..and the girls, knowing of Isabel's case, would have been in EXTRA fear during the event. I know if we were local and a man broke in, my kids would immediately think, "oh, no, its the bad man that took Isa!" and be LESS likely to keep quiet, because they would assume the goal is kidnapping. 10 is old enough to have that thought process.
Just sharing my thoughts, no judgements.