I didn't know there's an app that shows when someone opens an email! Maybe she read it and didn't have timeto answer immediately, and accidentally deleted it. Maybe she's extremely busy or on vacation. I wouldn't jump to the conclusion that she doesn't want to hear from you or answer you. I would give her another week and then write again, asking if she received that email. If she agreed to email, then I wouldn't worry. I do know how easy it is to jump to conclusions and feel rejected. I'd feel the same way.