A bedside urinal is a product you can test at the bed, which is exactly where it will be used at night. Whether a bedside option is right for her is a clinical question, so ask her physician first. If the answer is yes, the product choice comes down to a few checks you can run yourself.
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Run the test in her position
Sit her on the edge of the bed or set her in the position she actually sleeps and gets up from, then hand her the device. Watch whether she can find the handle without looking, hold it, and set it down again. A device that works only when she is standing up at a sink is not the one for this route.
Check the seal and the fit
Check that the opening fits her body in the position you tested. Check that the lid or cap closes fully and stays closed when the device is tipped, not only when it is sitting flat on a table in the store.
Check stability on the nightstand
Set the device on the nightstand or floor where it will live, then nudge it. It should stay upright. A device that tips when the bed shifts or when someone brushes past it at night is a hazard on the route.
Check emptying and cleaning
Decide who empties it and where, and set that routine for the morning, not for the middle of the night. Check whether the parts come apart for rinsing and whether they dry fully. Avoid any design you cannot clean all the way through.
Compare two options side by side
If you are comparing two devices, rate each one on the same five checks: grip, seal, stability, emptying and cleaning. Score them on how they work in her hands at the bed, not on how they look in the box.
What to write down
Write down her position during the test, which device she tried, whether she needed a second hand, whether the lid held, how the parts rinsed, and any skin change or discomfort she mentions. Bring that list to her physician, since those notes are clinical questions for them to answer. The How we write this desk page explains why this desk does not name brands.