My other half isn't much of a gamer but she has my old low end laptop and wants a co-op game that we can play together. We've previously played Minecraft together but nothing else, she just wants something we can play together.
Any good recommendations that are cheap and not graphic intensive?
Maybe Dungeon Defenders? It's an older 3D tower defense game. Although coop is generally played with 4 players. Not sure if you can play with only 2.
Since you've played Minecraft, how about Terraria?
How about a real time strategy game where you start off on the same team against AI?
Or an F2P MMORPG if you don't mind other players? Depends on how old the laptop is.
I'm sure others had the same question, so you could search for "casual/couch/local coop games" and see what comes up.