Giving gifts to little girls can be tricky as you don't know what they would want. A common gift for little girls would be jewelry but not every little girl likes jewelry and you never know if the jewelry you are giving is what they want.
Since Hannah Montana is all the rage with little girls these days, something along those lines would probably be appreciated as a gift. The problem is that Hannah Montana games are more often online games even though you can sometimes find 2 player games or more that have a Hannah Montana motif in them.
The truth is that in a sense you can give online games as a gift, it will just depend how you package it. When the little girls go to the Hannah Montana games sites, very often you can play part of the game for free and then in order to continue you have to pay. So if you can figure out a way to package a gift so that the little girl knows that the way she can continue is a gift then you can certainly give Hannah Montana games as gifts.
You really have to know the little girls to know if they would appreciate something like this. Very often, kids can't appreciate a gift that is not packaged in a box. They tend to expect to do everything online for free and may not understand that being able to continue playing the game is a gift.
If you really only want to give the Hannah Montana games as a gift then you may want to look in the software section of a computer store to see if they sell any of these games already on a CD. This way they get a packaged gift all wrapped up with a pretty bow and they can then put this is their computer and be able to play this game whenever they want. And they will always know that it is a real gift.