Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you today.
Now I am very sorry to say that there isn't really a way to overcome her incontinence without treating the underlying cause. The reason any other incontinence treatment would fail due to its not actually tackling the reason for her signs.
In regards ***** ***** reasons for her signs, was you may know she is overproducing her steroid hormones. This overproduction induces increased urinary output (so the urine tends to be more dilute as well) and when this happens, her bladder fills more quickly, she needs to go more often, and she can have accidents or leakage (since needing to go that much isn't something she has had to face all her life). As well, as her body pushes so much fluid out of her, she in turn needs to drink a lot to keep from becoming dangerously dehydrated. And I would just note that you do not to give into temptation of restricting water (as some people do) as this wouldn't solve the problem but instead risk harm in causing her to dehydrate.