The DLC, A Moment in Infinity, has Strea as an additional playable character and features her in an additional scenario.
https://store.steampowered.com/app/3047110/SWORD_ART_ONLINE_Fractured_Daydream__A_moment_in_Infinity/
Strea is available in "A moment in Infinity"
Source: Steam Community (opens in a new tab)