My Little Pony: Friendship is Magic - Image #258,034

To quote Jayson from his Reddit interview last year "i do like trixie. i think there is more to tell with her."
Will she be back in season 2 maybe, at least by season 3 she should be back.
You want my crazy theory, she or some other evil characters (diamond dogs, flim flam, gilda…) might try to ruin Princess Cadence's wedding. just a thought…