If you want to have a place for your daughter to return to (let's hope she never NEEDS to use it), think about putting a murphy bed in the room. Only put easily stored 'stuff' in front of it, so it can be used if needed.
As for customizing the room for your quilting needs, I'll suggest you wait until you can move into the other daughters room to customize. Or ask you other daughter to move over to the other room.
No matter what you do, enjoy!