Some sort of medical funnel might help her. The nurse at the surgeon's office may be able to help with getting her one, or you could check on line. I would call it medical funnel, female urination, something like that.
Talk to your gynecologist or surgeon who operated and learn about Kegel's exercises,consists of repeatedly contracting and relaxing the muscles that form part of the pelvic floor.You can also prefer Pelvic toning devices,like barbells(Chinese Ben Wa Balls),vaginal weights,cones (various designs are available in the market that are individualized) or remedies like TENS probe ,which increase vaginal elasticity and bladder control.