Sorry to hear about your worries with your girl
With the thirsty and clear urine, maybe she's just thirsty (some of mine drink a lot more than others), the more they drink the more they pee. Clear pee wouldn't be a bad thing - meaning they are getting enough to drink and are not dehydrated. If you are worried about the money, you could try testing her blood sugar level at fasting, fasting level should be below 75 -120mg. If you don't know someone who could lend you a blood glucose meter, let me know, my daughter is a type 1 diabetic and we have lots of old meters. I'd be happy to send one to you with a few test strips. If her fasting BS levels are ok, and she's not showing any other symptoms of diabetes (weight loss, poor coat and skin, fatigue, weakness ...) then she is probably ok.
As for the hearing, is Ella the parti in your avatar? Some dog breeds that have parti color and white color, also have problems with these colored dogs having hearing problems. Below is a little blurb I wrote for the Colorful Yorkie website.
Piebald gene and Deafness
by Sue White *
At this time, there does not appear to be a problem with deafness in the parti yorkie but this is *something that breeders must be aware of when breeding dogs that display the parti (piebald) gene.* We have been breeding parti colored yorkies for over 10 years and at least 5 generations but I've heard of no instances of deafness in the parti colored yorkie.
Congenital deafness has been reported in approximately 85 different dog breeds (including the traditional colored yorkshire terrier), it can show up in almost any breed but especially those who have white pigmentation.* There are two genes that are associated with deafness in dogs, one is the Merle gene (not seen in the yorkie) the other is the piebald gene which is the spotting gene that causes the coloring on the parti yorkies.
Dogs who have white heads tend to have greater chances of deafness (deafness in one ear or both), so it's thought that breeding dogs who have pigmented coloring on their heads, will lessen the chances of deafness.
If you suspect or are concerned that your traditional colored or parti colored yorkie may have a hearing problem, there is a special hearing test called the brainstem auditory evoked response test, also known as the “BAER” test, which will determine if there is a problem.
For more detailed information on Deafness and the Piebald gene please see the following links:
Genetics of Deafness in Dogs Deafness in Dogs & Cats
Good luck with Ella - sending prayers and positive thoughts your way.