Why didn’t she use the restroom as a precautionary measure when she knew they were close to landing?
When you have such a condition you learn to plan ahead to protect yourself.
My travel motto is never pass up the opportunity to use a clean restroom. Before it’s urgent or too late.
I don’t think this is the airlines fault at all.
I am a bathroom user. I hate public bathrooms and I hate those little bathrooms on a plane. Last thing I do before I leave the house is use the bathroom. Last thing I do before I board a plane is use the bathroom. I’ll also not drink anything to make sure I don’t have to use that little bathroom during a flight.