I wish posters would stop these sofa diagnoses of ASD.
I am an educational professional who's worked with kids and adults with ASD. It's a very complex area which is why it's diagnosed by drs, and educational psychologists with teacher/ parental input.
Statistically, it's more likely this child has not got ASD. Just because some parents on here have kids with ASD who exhibit these behaviours, doesn't mean the OP's DD is ASD!
When kids are 10 it's the prime age to start asserting authority and rebelling.
@Sofedupofitall As some posters have said, you need to come at this as a parenting issue, regardless of any 'label' that may or may not be accurate.
This not washing could be the start of the pre-teen and teenage years of pushing back against all you want her to do. Now, it's washing, in 3 years time it might be clothes, makeup, drugs, drinking, smoking...who knows!
It will be seen as neglectful by her school if she arrives smelling, dirty and with unkempt hair.
You need to find a way around all of this. NOT by taking things away but by giving treats and rewards for good behaviour.
Taking things away just causes resentment and doesn't work.
Reward good behaviour is the way to go.
But you also need to have a serious and frank discussion and tell her that people notice she smells.
You could also involve her school and a teacher to talk to her about her personal hygiene.