Molly Hooper: I don't count. What I'm trying to say is that, if there's anything I can do, anything you need, anything at all, you can have me.
Molly Hooper: No, I just mean... I mean... if there's anything you need - it's fine.
Sherlock Holmes: But what could I need from you?
Molly Hooper: Nothing. I don't know. But you could probably say 'Thank you'... actually.
Sherlock Holmes: Thank you.
SO MUCH IN THIS SCENE!
1) *But what could I need from you?* Sherlock was asing a genuine question. He wanted to know what he could do for her, He wanted to know if she truly cared.
2) *But you could probably say 'Thank you'... actually.* *Thank you.* She made him say thank you! Guys! SHE MADE HIM SAY THANK YOU!