Karren, definitely. She just clearly doesn't like Susan, and jumped at the opportunity to try and make her look bad in front of Lord Sugar and Nick, who seem to like Susan.
What Susan said wasn't very logical and phrased correctly, no, but it was easy to understand what she meant by the questions; "are the French family-oriented" and I don't think it was right of Karren to pick up on something that was said in a brainstorming session with a team mate. Of course, if it was in the middle of a pitch or something, then yes, that would be a bad move but it wasn't, and it was a complete non-issue blown out of proportion by Karren, who just came across as spiteful and petty.