She knows Sherlock so well. And you so see John's parenting of always reminding Abby to ask Sherlock if he wants to do something with her. :D

For a while there, it was fun to see Abby forcing Sherlock's hand by her assumption that he would want to adore her, but John and Sarah eventually laid down the law that it was best to ask before trying to do something with Uncle Sherlock, and you had to accept if he said no. They're still working on the concept that it's nice to ask if he wants hugs, too, but Abby finds it very difficult to comprehend why he wouldn't want a hug. Hugs are nice.

Dejeni: What if bad people kidnapped them and they hurt them and ask for a ransom?
Howard: If it's a ransom then they at least would be alive.
Dejeni: They might not be alive?!
Howard: No, no! I didn't say that!

Oh, awww!

Dejeni: Don't tell Maria about the kidnapping or the dead part.
Howard: What, do I look crazy? We aren't even telling her he's missing until he's not any more.
Dejeni: No, she has to come and find him.
Howard: I can find him.
Dejeni: Howard, call Maria. You need her mother powers.
Howard: I can find him! ...Give me an hour, then I'll call her,
Dejeni: Deal.