Sorry, I thought I'd already replied to this, my mind is crumbling with age!
Although when I'm in the room with Bramble she's all over me, when I've been away from her and I walk in, I've often seen her at a door or window looking as if she wanted to go out. Once, she had her head and one front leg out of a window that was, thankfully, not open wide enough for the rest of her to get out, though if she'd persevered I'm sure she would have pushed it open!
So she'll be going out tomorrow morning with Lily. If all goes well, they'll both be back in before the morning's out.
I am, of course, nervous, but if I leave it too long the weather will get milder, and she might not see the need to come in, just like before. I'm hoping she'll get used to the idea of going out AND coming in!