Forgive me for taking the easy option and presenting an embedded video with an advert at the beginning. It does, however, tell the story nicely.
We are not surprised are we? I am pleased the clinic employees understood that the female cat who wanted to get in was the mother of the kittens who were rescued and who were inside the clinic. I suppose something went wrong with the rescue because the rescuers, good as they were, separated mother from her kittens. We don’t know how it happened. There was probably a good reason for it.