He can be friends with her. She'll let him be her friend. She can do this. Or at least, she can do this as long as he doesn't know her secret. Doesn't know what she is, what she does. What she's become.
She bikes away form the store quickly, disgusted. Why did she do that? She stops, leans over, and pukes up the small amount of food she had been able to find that morning. Getting back on her bike, she continues, zigzagging up the hill like her father taught her before he left. She doesn't blame him for leaving; she'd have done the same.
Or, she would have. Now, though, she's turning into her mother... Maybe she should just stay here, be a fat whore like her mother. She feels herself start to puke again, but swallows it back down.
When she gets up the hill and to the house, she sees her younger sibling with friends, sitting under the small tree in the carefully manicured lawn. She knows her sister has a better life than she does, and that she's moderately happy here. She doesn't mean to, but she hates her for it.