It sounds like a little lag on her end. Sometimes if there is a little connection lag, trying to place a block can fail, just as she has described. Thank you, and thanks to her for explaining.
Here is one important thing to note, if this happens in the future, she can always feel free to /mail send a staff member, ideally BoysandGhouls or myself, RubensCherub, and just let us know, then she wont be banned for an accident or something beyond her control.
Her ban has been removed. Thank you.