A relative was diagnosed with BP a couple of years ago. I'm not sure how compliant she is to her medication, but once in a while (like almost every week) she acts like a complete brat (eg, posting insensitive, inflammatory or incoherent posts on social media, lashing out for the smallest of reasons or dumping her kid on long term periods with my ageing in laws). This means the people around her give in to her wants and whines all the time cos they don't want to make a fuss or let the kid get harmed.

My question is, to what extent can I blame her BP condition? Or is it just her shitty attitude and she's just using her BP as an excuse? Is she intentionally pushing her responsibilities away or is she genuinely not in control of her emotions all the time? 

I want to empathise with her but it gets harder and harder when she makes life of the ppl around her difficult. Please help me understand from the perspective of a BP patient. Thanks in advance!