As it should be, in every household, when your 19 year old daughter gets out of hand she should be sent to retrieve the "Brush". I believe strongly that if her offense is against her mother then it's mom who should be doing the spanking.
If the mother is timid about spanking then I have no problem spanking the mother for the behavior of the daughter. That teaches mom's that discipline must be maintained.
However, in a well trained domestic situation the daughter knows that she's reached the limit and lost to her higher authority.
She should know that everything comes down so the bare bottom is exposed.
And it should never be a concern as to whether she's embarrassed or too old for that kind of spanking. The mother knows that's how it has to be because, if she doesn't, when dad comes home both of them will be disciplined that way.
Many daughters try the whimpering routine just before going across the lap but it should never detour from the job at hand.
The job of a mother is to teach her daughter that society shouldn't have to put up with a disobedient and bratty girl.
The brush needs to be applied firmly and with strict rhythm. It should be an event that the defiant female doesn't want to soon have repeated.
This kind of punishment is also best delivered in an open room in the home and not a secluded area. The reason is that the point should be made that a spanking can, and will, occur when and wherever it needs to. The chances of the offender repeating her behavior is greatly reduced when she finds out that her spanking will even occur in the open area of the livingroom with the drapes open and with the possibility dad might walk right in at any moment.
In conclusion, it's always advised when applying the brush that it be on the bare bottom. The reason is that the brush causes the bottom to redden and bruise easier and faster. So, when the bottom is bare the spankee knows when the naughty female has learned her lesson.