oh, I'll get a support teacher to have a wee chat with her sometime next term'
That's so inadequate I don't know where to start.
Do you have any way of getting your dd seen by a Sensory Occupational Therapist, can you self-refer, because so many schools will not actually do anything until they have a professional's report and recommendations under their noses. "Pandering to parents' requests" becomes a whole other thing to them when a professional is involved.
Parents always assume SENCOs have lots of training for dealing with a variety of SN, but the reality is far from that.
Here's a suggested email for your paper trail
Dear [name of the clueless one]
Further to our chat at [time] on [day] at [name of school] when we discussed [name of dd's] personal hygiene issues, I'm afraid your suggestion of "' I'll get a support teacher to have a wee chat with her sometime next term' " will not address this issue in a satisfactory way.
Currently this is a cause of bullying [examples if you haven't already noted them] and needs to be tackled immediately.
My daughter has sensory issues and you don't appear to understand the impact of those on her daily life. Have you read Jean Ayers' 'Sensory Integration and the Child' and/or 'The Out of Sync Child' by Carol Kranowitz. They are often recommended to parents and anyone involved in the child's education and care as they describe the condition so well.
Her issues with personal hygiene are not a choice for her, she is not being lazy, she has neurological differences which cause this condition. She therefore needs help from a Professional to show her how she can cope with her own perceptions of the process of keeping clean [add some true ones here if you know what they are or omit if you think dd will be quizzed and deny. It's difficult for a kid with SPD to describe say a shower feeling like needles because they don't have any other sensation to compare it to. Do not give them any ammunition they could shoot you down with. ]
I would appreciate your help as SENCO to ensure that the correct interventions for my daughter are put into place and look forward to hearing from you to discuss those interventions as soon as possible.
Signoff.