>>46158951All in bed at night Anon, and she will be ready because she will read you as a book.
You need to ask her what she feels for you, what she sees in you.
The interaction will be more direct than with another female human, because a Gardevoir is interested in what she feels and sences in you, more than what you can say.
So be certain in what you will do, and ask her if she would like a hug in bed.
From there you just escalate with her.