Do you know what it's like? Being autistic and people touching you when you're overwhelmed?
It's like being harassed, and not being allowed to scream for help.
Sometimes it's like being sexually harassed especially if you've got little ones that like to be close to your breasts by putting their head on them or their hand.
I think your skin would crawl if it felt like you were being harassed.
It is like repeatedly being harassed, being traumatised, repeatedly having to ignore your own needs and boundaries, developing cPTSD, and then being judged for being a "bad parent".
Being snook up on and pounced on is so dysregulating. For some reason it's accepted that autistic children have meltdowns, but if an autistic adult does, or shouts, or has an involuntary reaction to stress, then they're demonised.
Nobody likes hearing about what life feels like for autistic adults, especially autistic parents, and it really shows on mumsnet just how little understanding some fully formed humans have about it, and even less tolerance.
The OP needs predictability, and she'd probably enjoy hugging her daughter a lot more if it felt within her control and like her own body and boundaries were being respected. It's hard to judge but it is also probably not her daughters fault she needs this sensory feedback and emotional closeness but I think we can acknowledge that without demonising the OPs actual lived experience of how her autism affects her as a parent.