Thanks everyone. I called the vet today and explained what was going on, and I've made an appointment for her tomorrow after work for a geriatric blood and urine panel. If anything, it will be for my own peace of mind, because I have holidays planned for the end of August and I want to make sure that everything is ok before I go. If I do need to change my plans, I will have enough time to make that decision.

I also wanted to say that she's not making more trips to the box than usual, it's just the volume that's changed, which I found interesting. It could be something as simple as she's hot in the apartment during the day, but I want to be totally sure before I feel confident to go away for a week. I will keep you all posted about our trip to the vet tomorrow (I am anticipating it being a challenge) and then when I can expect to get the blood work back. I'm hoping to be able to free catch her urine to save her the trauma of having her bladder aspirated but I know that's a possibility as well - keep your paws crossed that she will let me