The little girl could very well be Alice.
Also, I think the creepy nurse from Belle’s psyche ward may be the Queen of Hearts. Regina did give her the red rose, after all.
An edit to this post: The severe nurse was played an actress named Ingrid Torrance. She is not the Queen of Hearts we’ll be seeing in episode 17.
I’ve since discovered that the real Queen of Hearts will be played by an actress who’s making her debut to OUAT: Jennifer Koenig. This knowledge discredits the theories that either Regina or the nurse from the psyche ward are the Queen of Hearts.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy