The Batgirl movie has completed filming, but who knows when we will see it. It was supposed to come out late this year but I don't know if that is still the case. Michael Keaton is supposed to appear as Batman in it - but his return in The Flash which comes before this movie has been delayed at least a year due to a publicity nightmare with the increasingly erratic Ezra Miller. Will The Flash being pushed back so far create a domino effect for the rest of the DCEU movies? Hopefully we will get some clarification soon.
Storm and Batgirl first met in STF #3254... and in STF #2932 with the Birds of Prey...