How long has it been since you sent the email? Maybe something did happen, but not to her. Like maybe a family member is in the hospital so she hasn't been able to check emails. Or maybe she never received the email somehow. Did you type her email in correctly? I doubt she decided to stop responding without talking to you about it first. And it's not likely that something bad happened to her. I know it's hard, but try not to worry. Maybe she's just been really busy. Let us know if you get ahold of her.