Rather than re-typing instructions that are all over the net for how to move files around, go to
Google and do a search for "move files Windows" (without the quotes). You'll get over four million hits so there is plenty of help out there. Just choose the one that you find the easiest to follow.
Generally, making a program accessible by other user accounts entails putting a copy of the program's shortcut that's in your Start Menu folder into either the "All Users" Start Menu folder or the Start Menu folder of one specific account...in this case, your sister's.