The kennel might be awsome and are doing nothing wrong but your little ones could be frightened by the whole experience. When Yorkies are fearful instead of hiding they will challenge anything and become more aggressive in some situations. I have a 4#er that will take on the biggest dog in the world. I can never let him down around large dogs because he would be a snack to them.
Good luck and just keep watching...it could be she is going through her terrible two's.
