Milk thistle and sam-E help counteract the Deramax. But at her age and condition, it may not make much of a difference.

I suggest someone always be with her, too. Suppose she had fallen off the bridge into the water? 2 of my older dogs did this, neithr one was able to coordinate well enough to get her head above water. Fortunately I was right there to lift her up, and then get her out of the water. (The 2 dogs, they were 15 years apart, both were females).