Congratulations to your sister and welcome to the forums.
Make sure to have her download and read (or you download it for her) Ed's excellent crowd sourced Axis/Vegas owner's manual found here:
http://www.thorforums.com/forums/f10...nual-4961.html
I believe you're referring to the Axis 24.1 as there is no 20.1 and the 24.1 has the twin beds.