Cannibal crag.
The best after work, easy hike, good view, walk around to the top-rope rock in all of Red Rocks.
If I may throw in my personal opinion: just take her scrambling.
It's low tech and way more fun than technical climbing.
The savy might bring a short chunk of rope to ease the way past hard bits.
Really good fun!
Go in the afternoon and watch the sunset from atop the hill above Red Springs, the city beginning to glow in the distance...
PS: take TWO headlamps!