[nota]

the a/c when working will drip unless you are in a bone dry area
if it stops the unit is broken or clogged
as the unit cools the air the water condenses out and forms the drips

just extend the drip pipe to the ground in a small rock/sand pit
out of site and her mind
I would not add to a sewer drain as smells may back up in to the unit
and a trap to prevent smells will be a slime growth /clog point

a garden hose wash down of the out side unit is a good once a year procedure
just turn off the power
as is getting the foam cleaner spray on the inside coils [any hardware store]
and a cup of bleach to clear/clean the drain line of slime

biggest bit is changing/cleaning the filter regularly