Langhorne, who averages 18.1 points, missed three games because of back pain. She hadn’t played since June 26.
The Mystics (2-9) were led by Marissa Coleman’s 16 points, and Matee Ajavon added 13.
Washington closed to 76-71 but was held scoreless for the final 2:08.
Seattle built leads of 12 points five times, the last at 59-47 late in the third quarter.
The Mystics used long-range shooting to stay in the game, making 10 of 17 attempts from behind the 3-point arc. Washington cut its deficit to two at 61-59 on Nicky Anosike’s two free throws with 9:37 left.
By Douglas Holtz-Eakin
The young drop coverage to avoid higher premiums
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