Replying...
Intro. Gwen Tennyson is surprisingly visited by a mysterious looking woman that turned out to be her future self (Future Gwen). She seems to have mastered magic to an extent where she can open a portal that twists time. What would she possibly need from her current, weak form? Obviously, Future-Gwen's power levels would outmatch her own, non-magic karate power-kicks. Does it have to do with her cousin, Ben Tennyson?

Gwen & Future-Gwen Tennyson

@Matthew