Welcome...I'm sorry you have found us under these conditions.....Unfortunately, you are not the first.....The time to let go is a personal decision that we all must make.....From your description, I think Lily is still doing well......It sounds as if you have ALL bases covered.....Good going!
In my experience, She will let you know when it's time.Until then, feed her anything she wants.....I know you said she won't eat chicken, but have you tried cooking up some dishes such as Chicken & sweet potatoes or some chicken & rice? I boil them up together so the broth will season the rice or vegetables.....You can add veggies if she likes.....You can do the same with lean hamburger meat if needed....
Other things that dogs just love (And are healthy) are a dollop of Plain Yogurt or a small bowl of cottage cheese.....My dogs get this on a regular basis and it can be used as a kibble topper.....
Your canned food is an excellent choice because of the added moisture it provides!
My heart aches for you & your Lily, please know you both are in my prayers....
Sadly, we have a lengthy thread on this subject on the forum.....I will provide the link, but must warn you, it's SAD! There is however, a lot of great information that may help you with your decisions......
Here it is:
http://www.medhelp.org/posts/Dogs/4th-stage-renal-failure-in-my-dog/show/425814?page=1
Let us know how you both are doing.....We are here for you, Karla