What happened to my friend s Facebook account?

I tried to e-mail my friend on Facebook the other day and it said at the top of the chat bar "you cannot reply to this message." And her Facebook was gone. Facebook also deleted her messages. They all say "These messages been remove because they was found as abusive or spam" Why are they saying that? she didn t say anything that bothered me. Today our other friend said she tried to go on her account and it come up with the thing that said "This link doesn t exist or had been removed" She said she hadn t been on there and don t know what happened.