Did I do the right thing?

I had to put my pretty precious Patches down, a week ago today. She was 13 1/2 years old. She was my baby girl. My other dog Tobie, (her brother), passed away two years ago this Valentines Day. They are together now at "Rainbow Bridge". Tobie was diagnosed with kidney disease. One morning he fell over trying to pee. That's when I knew it was time. The very same thing happened with Patches. She fell over trying to pee, in the exact same spot where Tobie fell. I feel like Tobie was calling her home. Two weeks ago, Patches didn't want to go on walks anymore and last Saturday she had a seizure. The next morning she fell over, so I took her to the vet. The vet wanted $800 to $1000 to check her out because she was very dehydrated and weak. They couldn't guarantee anything. I didn't want her to possibly die in the hospital, alone and without me. So I decided to let her go peacefully, with her in my arms. I was proud to be their mom. They were my heart. Did I do the right thing? :(