games and movies

Let's play a game.
I tell a story.
I leave out a very big part of the details.
And then you can guess the title of the movie.

Good plan?
Here it comes.

This movie is about  of a young girl, about 10 or 11 years old. She's poor and she lives with her aunt.
The aunt treats her like trash. At the end of the movie the girl the girl appears to be filthy rich because of the inheritance her parent (or someone else left her.

Beware... the details might not be accurate.

Funny game isn't it?
No?
Okay, I believe you.
It's actually a movie I saw once, when I was a little girl.
I kind of forgot most of the story, and I believe somewhere along the line, I mixed this story up with the one of 'the secret garden'. Why so, I believed the aunt was portrayed by Maggie Smith. Sadly IDMB tells me there is no such movie in her repertoire.

In other words, I still have no clue which movie I'm looking for.
Feel free to help me out if you have a hunch.

That's all for tonight, folks.
Sweet dreams.