When was her last urinalysis? Culture?
Chiropractic will help incontinence, as will acupuncture and there are chinese herbs to help also.
Don't know if these are anywhere close to you:
Daniel King, DVM, CVA
Specialty: Small Animal, Equine
Tolono, IL 61880, USA
Tele: (217)485-7387
Fax: (217)485-8388
Email: dvmchiro_avca@soltec.net
Ellen Paul-Kuchenbrod, DVM
Urbana, IL 61802, USA
Tele: (217) 344-1017
Fax: (217) 344-0654
Email: petdoc@insightbb.com
Kathleen Von Ruff, DVM
Specialty: Small Animal
Gibson City, IL 60936-7143, USA
Tele: (217)749-2358
Email: kvonruff@prairienet.net
Delores Lipton DVM Urbana IL 217-344-1017
Although I am not a fan of Proin, I suspect you are using a generic rather than brand, which may make a difference.