Why can't I add someone on snapchat?

[Cameron]

I sent a snapchat to everyone on my friends list, and then a few minutes later after one of my friends opened it, she was no longer on my friends list. I know she didn't change her username or delete it because i saw her using it today. I tried to add her again and it says the account could not be found. I then created another account to see if it was just a snapchat error, but it worked on the fake account. Have I been blocked, or unfriended?

[Penguin Power]

The same thing happened to me with my friend a couple of days ago, actually. She blocked you. It may have been on accident, since that was what happened with my friend. If you were unfriended you would still be able to add her.
I hope helped!!!