I am sorry for your loss of Ginger. My heart breaks for you and your family. Please give Buster losts of extra hugs, I am sure that he feels a little lost without his sis.
I lost my boy suddenly back in December, we still miss him so much. He and Copper were so close, they played and wrestled and slept to gether. Copper was very depressed after Rocky passed. And would wait by the door for Rocky to come home, he even tried to sleep in Rocky's crate.

In Feb. we brought home a new little girl and it took Copper a few weeks to warm up, but now they too are close. I love having two. I think when you are ready you will just know, It is amazing how the right one just jumps out at you when your ready.
RIP little Ginger