Really struggling with this. My 13 yr old has suspected ADHD and really resists showering. I felt like over the last couple of yrs i have been constantly battling with her to have a shower and wash her hair a min of a couple of times a week. Its been hard and she will lie and pretend she has when she hasnt.
We had a big meltdown a couple of weeks ago where she insisted that my telling or reminding her to shower was really unhelpful, felt like criticism to her and like i was telling her she smells. She also said it felt controlling and 'weird' for me to be monitoring when she showers. She was v upset and we agreed that i would stop asking her and she would do it on her own timetable.
So here we are, two weeks later, not a single shower has been had, shes starting to smell and her hair is very greasy.
I dont know where to go from here? Normal parenting e.g. providing rules of how often to wash, reminding and punishing just end up in her having meltdowns, not sleeping and accusations of us not loving her, etc. Its exhausting and doesnt seem to help?
Im trying to detatch my embarrasment about the whole thing (shes starting to look homeless) from the situation. I recognise she has to be able to manage her hygiene herself as she gets older, but im her parent and have a duty of care.
Long term how does this play out if i go against what we agreed and start with the requests to shower again? Im so confused and constantly weighing up my responsibility as a parent with getting her to trust me. WTF do i do? Dreading her going back to school like this, but maybe a friend telling her she stinks, while awful for her, might be what she needs to just get her to bloody wash! 
Any advice? Sorry its so long!