Chapter 1 "The start"

Lilly looks for the apple tree where she ofthen takes apples. She doesn't find it and starts to hear a voice in her mind. She thinks about it and it's not her thats talking in her mind. It's someone or something else. She looks back and sees the apple tree about 10 meters from her. Why didn't she see it? And what is that voice? Thats where it all started.
What's that voice and what does it want?