Looks like Trixie's Kathleen Barr did Queen Chrysalis, and Britt Mckillip from all sorts of neat stuff did Cadence. The best villian
(woops-im tired, too much Chrysalis in this drawfriend! )
You also may have seen Sibsy's pony, "Wildfire" arguing with a colt at one point.
Looks like it wasn't her voicing it. It was still really neat to see her!