I am sure there is such a word. Think of it as combining elements of harsh, uncaring, inconsiderate treatment with neglect and indifference.
For example, a parent that forces a child to do some particular activity they don't enjoy, harshly overruling their objections and indifferent to how it makes the child feel (and yes "abuse" is too extreme).
The word would fit sentences like:
She was treated [WORD].
She was left downtrodden after being treated [WORD] for so long.
I am looking for words more specific than words like "miserably" or "poorly" - the word would almost be synonymous with "roughly", "harshly", but with greater connotations of neglect and indifference. I am sure the word is out there but it escapes me (and I have consulted a thesaurus!)