That's probably how most people play her, an hybrid of sort between support role through heroism, death ward and the like, hex on the big meanie, and nuke role the rest of time.
Ways to take advantage of Ember (lol I can't believe they screwed up the spells available on the class progression screen - this was working properly last time I played):
(1) Conjuration
Doesn't need Spell Pen so can take Summoning Feats instead, and Summoning frees up action economy for Hexes. Spontaneous can even get away with the Summoning Mythics instead of Abundant, and Summoning gets item support midgame as well.
Starts with Precise for Snowballs. Web, Glitterdust, Stinking Cloud (vs Human Casters), Cave Fangs, and Rift of Ruin are are very good crowd control that bypass SR. At levels without a good spell you have the good buffs. Can still switch to Hellfires at CL19.
(2) Necromancy
She has access to all the Necro Rays and starts with Precise. Spamming Enervation with meta Rods is pretty good vs Bosses since no save. Fear is Shaken even on made save, Plague Storm is nasty and the she gets the late nukes. Can take Plagued Beneficial Curse to boost Disease spells (very little immune to Disease). Note: Scare is great for early game, especially Tavern fight. Umbral Strike bypasses concealment but she gets True Seeing, Mass.
(3) Enchanter
Her unique Ninth Level spell is an Enchantment. She gets just enough decent/good ones (Command, Hold/Hold, Mass, Crushing, Confusion -> main go to, Mind Fog, Power Words, Insanity, Feeble) to be viable (you use Hexes on fights where they don't apply) but hard to reliably beat saves on high difficulties without MC Mythic abilities.
(4) Evocation
Can use Sorcerous Reflex/Rods to get around Full Round Meta problem. Swift cast/standard Hex but touch burn is short range while Hexes are Medium. Also gets some control via Ice/Volcanic Storm Difficult Terrain, lategame Stormbolts, Chain Lightning, and Hellfires. Burning Arc doesn't need an attack and Molten Orb counts as a weapon so gets her -4 malus (goes down to -2 at lvl 10)
(5) Frightful Aspect + Transformation + Elven Proficiencies (Radiance)
Go off king.
In any case you'll want to make sure to pick up Beast's Gift and Lifegiver. I like Agony (60 ft range) and Delicious Fright can be good until you get Frightful if you use a lot of Shatter. Major Healing ticks up to Critical at lvl 15 so also worth picking up.