Other issues:
Hyphen Abuse: At some points you seem to hyphenated two words that don't need it. Example: "She and Stacyh ad shared everything from milk cartons in kindergarten to first bra-shopping experineces to crushes and boyfriends." I think it works fine as "to first bra shopping experiences." Actually, though, it would be better as "to first underwear shopping experiences."
Paragraphing: I guess you might like the short lines split from each other, but in reality this formatting is frankly pretty annoying. I'd rather have clustered paragraphs, it looks better and reads better. If you're going for effect again, I'd suggest not to overdo it. You definitely need a lot more detail anyway in your first chapter, cos it's pretty sparse at the moment. Basically it needs "filling".
Spelling and Grammar: Yeh, you probably know this, but there's a lot of mistakes. I know you rushed it, but sort it!
Pointless Detail
“Couldn’ hold off, huh hon?” Beck’s mother said, spatulaing the cookies onto the countertop.
“Hmm mm, mom,” Beck replied with vigor as she enveloped the cookie in her mouth and grabbing another.
“That’s all right, me neither,” the other woman said, grabbing a cookie and dipping it in Beck’s milk. “And how’s the mutt?”
“Elmo is fine. I took him on a walk.”
“Hmm.”
Beck finished her cookie. “Well, homework calls.”
Why do you need to mention about the cookies and the milk? It seems just needless detail. Narrative in stories should always have a purpose - and this just seems like you have nothing to do but describe their actions which adds nothing. Cut out the "grabbing a cookie" parts and leave the dialogue and describe only what is neccesary and can add to the effect or drama of their conversation.
Transition
The clock-times aren't working for me. Yeh, use them, but it seems to be a result of laziness. The change in structure is odd and probably will need some fixing to make it more continuous.
Otherwise, very creepy. It certainly caught my attention, and that's always a good thing. Post more!
