New Pet Rat Question?

Hey everyone! Today I introduced my new baby dumbo rat to my almost year old hooded rats cage. Both are female. They have been in the same cage for a few hours, and there has been a little fighting/wrestling, but what I did notice was that when the dumbo went to sleep in a little boxed bed I made for her, my hooded rat slept outside of her box, and I am wondering, what does this mean? They are still wrestling a bit? Any suggestions or insight would be great, thanks!