I have a 10-year old K5SS and it's a workhorse! I also prefer the manual lift-head models to the tilt-back models, mainly for their sturdiness and power. If your Mom doesn't plan to use her mixer for a lot of large, heavy-duty jobs, she may prefer the tilt-back model, as it's more convenient to use. Otherwise, go for the bigger guns.
Unlike Vacuumfreeeke's experience, I've been putting all the beaters/dough hooks/whisks in the dishwasher for a decade without a problem.
If your Mom cooks a lot, an extra bowl and flat beater would be a great accessory gift. I have three bowls and 3 beaters for mine. They come in handy when making several items; you don't have to stop and wash everything.
Unlike Vacuumfreeeke's experience, I've been putting all the beaters/dough hooks/whisks in the dishwasher for a decade without a problem.
If your Mom cooks a lot, an extra bowl and flat beater would be a great accessory gift. I have three bowls and 3 beaters for mine. They come in handy when making several items; you don't have to stop and wash everything.