The actress, who has played Morgana in five series of BBC One fantasy adventure Merlin, told Metro that she was excited by the planned follow-ups.
"My friend once sculpted me a bust of Admiral Ackbar from Star Wars," said McGrath.
"He's my favourite character in the films after Han Solo. He's that goldfish-type alien in the white costume. 'It's a trap!' I'm a big geek."
She added of Episodes VII, VIII and IX: "I'm very excited about the possibility they could be like the first three, I'm a bit scared they might be like the prequels."
"You get to have all the powers of a Dark Sith Lord but if you say you're sorry you still get the blue aura around you when you die.
"There also haven't been any bad women in Star Wars. And I'd love to get my own Star Wars action figure."
Toy Story 3 writer Michael Arndt has been hired to write Episode VII, while Ewan McGregor, Samuel L Jackson and Peter Serafinowicz have said that they would like to return to the series.
Watch Ewan McGregor discuss Star Wars Episode 7 below: