hihi! trauma and abuse do tend to fall under "dark themes", but it is difficult to say if that's what the original prompter intended for their do not wants because every case might look a little different since it is a somewhat vague and broad term!
unfortunately, without knowing your prompt and/or how you plan to develop your fic (for example, how extensively would you explore these themes? would it only be mentioned in passing? etc.), we cannot really provide you with a more pertinent answer! if you feel comfy enough, however, do send us a dm so that we can help you navigate this issue properly and better advise you ^^