I can't see my sisters photo but my friend can

Someone please hello!! My sister and I are very close. She lives in the U.S. a couple days ago we were online at the same time, she read my messages one minute before I came on and then 30 seconds later her profile photo disappeared. But my friend who I asked to add her without messaging was able to see her profile photo.
Her status was usually one of the defaults. But when a person who doesn't have a photo and doesn't have have the Hey There I'm Using Whatsapp" message as their status and no other status and no last seen on my end have they deleted their account or is it network failure on their end? I have no problem communicating with my other contacts just my sister these past few days.

I called her number and it rings just like it does usually, I left her a voice message and sent her texts. What is going on?!!!