For most of her life, Emma Frost thought only of her own needs and goals, seeing humanity as inferior to her own mutant race. She used her intelligence, charm, and telepathic powers to accumulate great wealth. Soon she joined the mysterious Hellfire Club, a group secretly dedicated to world domination. For years she helped that group gain the political and economic influence it desired, often clashing with the X-Men.Marvel Source
Over time, however, Emma came to see the teaching of young mutants as her true calling. Eventually she allied with Professor Charles Xavier and her former enemies, becoming a full-fledged member of the X-Men and a teacher at the Xavier School.
Open with Telepathic Torment to give enemies in the targeted area 10% vulnerability. Then dash in with Lustrous Lunge, and pop Sudden Dread for great AOE CC/DOT & Inspire Minion to wipe (most) aggro with a pet taunt that also adds a DOT. At every opportunity, use Unlock Potential to buff everyone's (including your own) damage output... especially before using the king (or queen) of CC abilities: Kneel Before Me. Rinse and repeat.
Whenever the good stuff's on cooldown, spam your basic attacks: Psi Bolt for dealing with trash, or Astral Bolt for single target dames/spirit regen against bosses/elites.
If spirit permits, feel free to use Drain Psyche on bosses/elites for some decent single target DPS/health gain.
Beyond that, between Mental Cloaking for stealth/aggro drop, Frenzied Confusion for even more aggro drop, [item]198[/item] Pluvian Superconductor for a quick AOE CC freeze, and of course Lustrous Lunge, you should have the tools to get yourself out of most jams.