I am worried about Charlie

Charlie's breathing doesn't seem 100% right. I noticed it this morning... it is sort of shorter and slightly heavier than normal. I'll be watching her tonight and tomorrow. If it doesn't get any worse, I will take her to the vet Tuesday morning, if it does get worse, I'll take her to the emergency vet. I do hope she is ok. She is already 8 years old, so everything out of the ordinary is a worry!

Here's a couple of pictures I took of Charlie today and one of her mate Magic.