I don't totally get it
They didn't take the money silly .
Applebloom lost it.
Nah, he doesn't know about the tooth fairy yet.
Hah yeah, my mom has watched MLP before, so she would understand that these are the only characters that would suit this, but otherwise she might have also wondered why I depicted my nephew and I as femalesXD!
Oh, no it wasn't like that.
My niece watches a lot of cartoons, and sometimes you can't help but to watch them as well, and MLP is one of those cartoons.
What it is supposed to be is that Applebloom is asking Granny if she knew where her misplaced tooth fairy money was, after hearing about it Applejack asked Applebloom if she had lost a tooth(another way of asking if one of her teeth fell out).
Applebloom didn't understand what Applejack meant, so she responded that she lost(as in misplaced) the money and not the tooth.