Hi there,
I am currently looking to be diagnosed with bipolar and came across a website from a first person perspective which included diary enteries.
From reading a few of them, it got to the point where it seemed to me they were blaming eveything on being bipolar, and more worryingly thinking about abusing their medication to change their circumstances.
With bipolar disorder it is difficult to know where the disorder ends and you begin since it is all so intertwined.
What I recommend is possibly talking with your mom and her psychiatrist about this (or possibly ring her psychiatrist and ask them to talk to her about it without mentioning you brought it up) and tease the real her out of the disorder. If this isn't possible I would mention it to your doctor, they're there to help and advise you. Avoid approaching her when you suspect she is depressed/manic, especially if she is type 1.
You could also try mentioning it to her, or getting her to write a list about herself eg: what she likes/doesn't/ how she feels about certain things.
I tried blocking my bipolarity for 2 years (unsuccesfully by avoiding things that would make me think, and somethings that would cause emotion, I don't recommend this half life) but it has made me realise now that it has came back that you cannot let it rule your life and neither is it helpful or excusable to blame or explain everything on it. Our emotions CAN be seporate from our bipolarity and there is the real us underneath. Sometimes we just can't find it.
I hope this helps in some way. Remember she needs your support but your health is important too! x