So my fiance who lives in another country is opening all my emails I send her but is refusing to talk on skype?

So it started 18 days ago. My fiance and I were talking on skype pretty much every night. Well our last night we talked she I told her that her visa is being processed to bring her to America and she said she cannot wait. I asked her if she has any concerns and her answer was yes I worry you change mind. Well that will never happen. So the next day I get an email saying she is ill. Well she had cancer a few years ago so her health is a big concern for us both. I made her some promises last time we were together. They were I would never cheat on her, never leave her and never change my mind about marrying her. It was an easy promise to make I love her very much. Well I logged on skype that night I knew she would not log on but I will not stand her up she would feel I left her. She was married before and her husband left her the day she found out she was pregnant. Well the next tuesday she sends me another email saying she loves me and now her son is sick too. Well I log on skype again that night like I said I will not stand her up. Oh side note she loves to get emails from me and I use spypig to notify me when she opens them I like to know she is reading them. Well wednesday I log on skype and she is not there. About once a month or so she goes through a phase where she does not want to talk for a few days and pushes me away. She gets lonely and fearful I leave her. Well I usually talk her through with emails. Well it is wed. and nothing no email or text saying she is better or worse. I am getting a bit worried at this point. Thursday no skype no emails nothing I am now thinking maybe she is going through a phase on me. I start sending her text messages. Friday no skype or emails form her I am now panicking. She is not opening emails and that should tell me she is sick but I am panicked. No matter what she always opens emails even if she is mad at me. Well I send her more text messages basically saying why are you not talking to me? Why no skype blah blah blah. I send her like 6 texts. I know I am a moron. Sat. no skype or messages I send her more text messages she finally sends me a message saying " i am busy why you send so many messages"? Well now I am full on panicked busy!! Too busy for your fiance I am thinking. So sunday no skype or email so I send her more messages trying to get her to talk. Monday and more texts from me finally she is mad now and says I told you I am ill I cannot come to America. Well I know she wants to marry she talked about it a lot and made me promise to marry her. Well since then I have sent her few text messages and just emails but I have been trying to get her to talk. I have done what I always do and sweet talk her into talking to me again. This time it is not working. I made her pretty mad. I also think with her health she is worried about such a big move. She knows no one her and gets scared easily. She is fearful I leave her or cheat on her. I have asked her to end it if she does not love me or does not wish to marry. She reads the emails but does not respond. I have been sending her a bunch of emails it is not working. I pushed at her while she was ill and now she refuses to talk on skype or send me more then a hi how are you email once in a week. I am afraid to back off too much she will think I am giving up. An ultimatum will not work she will give in to her fear and not talk at all. I need help I just want to talk again. I need her help planning our wedding I am doing all this by myself. I need advice thanks. I have never been in love before so I have made some idiot mistakes.