Yeah, Rip said that his parents built the Vanishing Point but we don't know how. If Booster could get better at tech enough to control it in TMVP then Steph could too. Neither of Rips' parents seemed to be able to update Skeets without Brainy 5s' help anyway.
But the thing that occurred to me that made me think "yeah that has possiblities"? Stephanies' father is the Cluemaster, a Riddler like character. And what does Rip do? He leaves cryptic messages on his blackboard.
Of course if this was true it'd also mean he had a older half-sister.