Heidi's expression made it clear that she was not supposed to be there by herself.  "Daddy is in his study room and the nanny was not there."  She looked at Mrs. Pearson with a shameful expression.  "I'm supposed to be at nap.  But the horses need me."

About then the nanny came out rushing then seeing Heidi her relief was clear.  "She got away from me again."  She said with a shook of her head.  "Sorry, about that Mrs. Pearson.  It's getting harder to keep her down for naps."  She then noticed Delilah. 

Heidi trying to stay out of trouble, introduced the ladies.  "This is Miss Delala the new maid, Nanny."  She then looked at Delilah, "This is Nanny.  She takes care of me and will be taking care of our twins.  I will be having a little brother and a little sister after the wedding party."