What computer operating system is your Premiere Elements 11 running?
In what form is your slideshow - DVD-VIDEO on DVD disc, file saved to hard drive, or other?
Your best choice is to depend on the repeat option of the player.
If a burn to DVD-VIDEO on DVD disc, you could use a 3rd party software in conjunction with Premiere Elements to create a looping DVD-VIDEO on DVD disc. Details are described in the following link
Depending how long the slideshow is, you could create a slideshow with repeats (as many as possible) of Timeline content.
Please review, consider, and supply more details. If any questions or need clarification, please do not hesitate to ask.