Best response would be to ignore that, and this is how. Respond with "well D3 will be home soon" and then quickly get off phone. See how that played out

"I mis you guys"

"Well, D3 will be home soon. Oh shoot movie is back on, gotta go."

Let's say she gets direct again.

Still use the "oh shoot, movie back on" line.

Is it obvious. Yes.

Is it rude. No.

Try it. I think it will help you to detach once you try more.

You don't ALWAYS have to answer her. She did ask for separation. Separation means space.