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It sounds to me like that was a great tip, and well worth it to you as well. Since it took her hours of hard work on grooming your dog due to all of the mats, she had certainly earned the large tip, and $35 seems like a very reasonable price.
It has been a while since I used a groomer; but I think that I paid $40 just for my little Malti-poo, and she didn't require anywhere near as much work to groom.
I don't think that there is a set amount for tipping with a groomer, it is more how much they charge and how good of a job they do, as well as what kind of shape the dog's coat is in, of course.
I would guess that it is about the same as tipping when you get your hair done at a beauty shop, you go by how nice it looks, and how long it took them to cut and style your hair.
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