Be prepared for her to toss a top in the washer then dry it so she can wear it to school. Be prepared for her to load the washer with everything she owns and wash it on the wrong temp, be covered in soap when it comes out, and gets put in the dryer to gunk it up.
If you decide to do this you need to sit down and close your eyes. What is the first thing you do when you decide to do laundry. How do you sort your clothes? Do you have dry clean only? Do you separate darks and lights and towels from spandex/lycra yoga pants? Do you dry everything or do you sort it out and hang part of it to dry?
How do YOU do your laundry? She needs to learn step 1, step 2, step 3, etc....
When I taught people with developmental disabilities I started at:
step 1. Sorting clothes with the intention of getting them clean and wearable.
That means knowing how to read a label or understand the pictures on the labels. Cold water. Red items. Jeans fade each and every time they're washed so they turn all the lighter items gray. If it's dry clean you have to decide if it's really washable or if it will ruin it to wash it. Learning the fabrics and what the labels mean before she ever touches the machines.
Of course she can do laundry with supervision but many people think this is "teaching" but this isn't. They can't start to finish do a load of clothes at this point. They need complete supervision.
Step 2. They need to understand the workings of the machine. How to set it, how to put detergent in, what to do with bleach or additives, what NOT to do. So they don't ruin their clothes.
Step 3. Then you need to teach her what a load is. That it's not one or two things and it's not stuffed where the water doesn't circulate. I have adult friends who think if there is any room on top for more clothes it's not a full load. They have ugly laundry.
Step 4. Have her sort the clothes from the whole household a few times. This way she gets to sort sheets, towels, blankets, clothes, etc...see how she did.
She can do her own laundry and you can teach her to do it effectively. Help her so she can learn to do it right.
Good luck!