Looking for local fantasy co-op games!

Barony
Gauntlet Slayer Edition

Pummel Party
Children of Morta
Lovers in a Dangerous Spacetime
Hammerwatch
Streets of Rogue
Magicka 2
Nine Parchments
Castle Crashers®
DYNASTY WARRIORS 8
Death Road to Canada
Dungeon Defenders

Not fantasy, but if you like being able to slaughter everything in your path, broforce is a very fun local coop

Evil Islands. Old but good

Wolcen: Lords of Mayhem
BattleBlock Theater
Trine

EARTH DEFENSE FORCE 4.1 The Shadow of New Despair is good
Resident Evil Revelations 2 / Biohazard Revelations 2
Serious Sam HD: The First Encounter

DeathSpank
DeathSpank: Thongs of Virtue
The Baconing (DeathSpank 3)

Humorous hack & and slash games with 2nd player mostly as support.

Baldur's Gates and Everquests on PS2.

What about Trine games? also check For the King, but this one may be too hard >_<
Magicka is a funny game too if she like to smash people into pieces

Diablo.

There's also the various Smash Bros games.

If you've got a PS2 era console, or are willing to use an emulator, the Baldur's Gate: Dark Alliance / Champions of Norrath games by Snowblind are probably the best local co-op games I've ever played. Fallout Tactics: Brotherhood of Steel utilizes the same engine, but is less well received. The Hunter: Reckoning console game series is also somewhat similar in mechanics and style, though perhaps a bit less polished.

On PC, Icewind Dale and the Trine series are highly recommendable for co-op [though I'm not sure about their having couch co-op, if that's what you mean by local]. Snowblind also did Lord of the Rings: War in the North, so that's a consideration, though it doesn't play anything like their previous console games.

FORCED
Full Metal Furies
Gauntlet
Helldivers
Lara Croft and the Guardian of Light
Magicka
Nex Machina
Wizard of Legend

Victor Vran is a great game ,i think it also works well in co op.i have it.

I don't know Vikings, but I would recommend Victor Vran. It's pretty approachable for a new gamer--no huge skill tree to worry about: skills are tied to weapon-types, and you can freely change weapons, outfits, and demonic powers on the go. You can cut through hundreds of monsters on easy mode, or crank up the difficulty with "hexes" or permadeath. It still has one of the highest play-times in my library despite my not being able to play for over 2 years due to a series of bugs with the Mac version. (The Windows version is still fine as far as I can tell.)

I would also recommend Crypt of the Necrodancer, though that's more like speed chess set to a beat so I'm not sure it would be her style.

Divinity Original Sin (1 & 2) have coop. There's a bit of reading/listening since it's an RPG. If you just want to mindlessly kill things without talking to a lot of NPCs and doing quests, try Torchlight 2.

Eon Altar (cool RPG)
The Cave (co-op platformer, very funny and not too hard)
The Deadly Tower of Monsters (a really fun co-op game reminiscent of old scifi B movies but hilariously parodic)
HeartZ: Co-Hope Puzzles (a little gem of co-op platforming)

Or for something a little less underrated, pretty much every LEGO game. The Star Wars, LOTR and Indiana Jones games topping them all but the Lego Movie, and the Marvel and DC titles are also a lot of fun to play co-op. You won't get bored and they're not too hard for a newbie.

Darksiders Genisis is something I havent played much of yet, but its next on my list to play co op with my friend.
Lara Croft and the Guardian of Light is another good one. I played it ages ago, and I found it fun.

If you dont mind local co op instead of couch co op, then Portal 2 is amazing. Its first person, but not a shooter so it should be fine. Quick reflexes not needed. Very girlfriend friendly.

Torchlight 2 is another good one with local co op.

Aragami was not very polished, but I would still recommend it. It was fun while it lasted.

Orcs must die is co op tower defense. Sanctum 2 is better, but that one is FPS.

And finally, Spiral Knights was fun. Its online MMO style, but you can just play it together. Fun graphics and very fun gameplay. Gets grindy towards the end.

Most of the LEGO games are local co-op.
All of The Behemoth's games are local co-op. https://store.steampowered.com/developer/thebehemoth
Awesomenauts
Hammerwatch
Children of Morta

As others have said...
Gauntlet Slayer Edition
Forced
Helldivers
Torchlight 2

Sorry don't chat much therefor don't know syntax.