You can refresh your spell-like abilities by expending spell energy.
Benefit(s): You can expend two arcane spell slots or prepared spells to cast one of your racial spell-like abilities. The level of each expended spell must be equal to or higher than the sorcerer/wizard spell level of the spell-like ability you want to cast.
Pathfinder Roleplaying Game Monster Codex © 2014, Paizo Inc.; Authors: Dennis Baker, Jesse Benner, Logan Bonner, Jason Bulmahn, Ross Byers, John Compton, Robert N. Emerson, Jonathan H. Keith, Dale C. McCoy, Jr., Mark Moreland, Tom Phillips, Stephen Radney-MacFarland, Sean K Reynolds, Thomas M. Reid, Patrick Renie, Mark Seifter, Tork Shaw, Neil Spicer, Owen K.C. Stephens, and Russ Taylor.