There is, although this particular case does not directly raise feminist issues.
In a new review of more than 100 UK cases, we find that despite claims: ‘mercy killings’ are not the wanted, ‘hastened’ deaths that need assisted dying. They are overwhelmingly violent domestic homicides of women, by men: and show that our society is still poor at detecting and responding to domestic abuse. How will these men who kill behave when the state offers lawful death ?
https://theotherhalf.uk/safeguarding-women-in-assisted-dying
I don't think it's right to call it 'assisted dying' for such a young child, or for anyone without capacity to consent. This was not a child who wanted to die but needed assistance. This was a child who was euthanised because the parents and doctors considered their suffering to be unbearable with no hope of improvement. The child was PTS.
It's easy to make a case that for this child it was the right thing to do, although according to the article, the second opinion doctor said palliative care would be effective.
Stepping back from the facts of this particular case, this does indirectly relate to feminist concerns around assisted dying because it's killing a person who cannot consent. Care homes are full of old women with dementia, with only a smattering of men. This is a heart rending case which could be used to justify a slippery slope I do not want the UK to go down.