She used to open her mouth too like she was going to meow and nothing came out. Then we started to hear her and she had that funny sound. All look in her mouth when she wakes up. Thank you for all your input. Your pics are very nice :)
So she's been meowing like this from the very beginning, since you've had her? It may just be her own personal voice. I've had very loud cats and my most recent kitty is so quiet, I only hear her when she's sitting on my chest. It's funny to see your cat across the room open her mouth and nothing much comes out.
One more thing - you could take a peek in her mouth and back of her throat to make sure she doesn't have any odd spots of white (plaque) in there. Usually an animal with that would also have trouble eating. Probably not the case with your cat.
No breathing difficulties, she runs and plays a lot. She eat very well too. She looks great and healthy. Then when she meows it sounds so funny, like underwater. I don't know how else to describe hear meow. I've never had cats before, so this is all new to me.
Do you notice any breathing difficulties? I wonder if she has some upper respiratory illness going on.