Don't need anything major. If they commit to more shorts, just have her show up for a brief moment in one and tell Marvin over a video message to hurry up and blow up the Earth or something. Just include her in a way that doesn't detract too heavily from the short as a whole.
If they end up doing something more like The Looney Tunes Show in the future however, I'd say having her as a supporting character in Marvin-focused episodes/plotlines would also be the go. Maybe have her try to adjust to life on Earth as an alien monarch that nobody takes seriously, or an episode where Marvin desperately tries to arrange a public outing befitting a queen. Something simple and open to comedy.