Clarity and steps for helping mom dealing with mental health crisis?

Hi, my mom is in her 60s, diagnosed with bipolar maybe 20 years ago. She has been dealing with concerning behavior lately and my sister and I have no clue what to do. She does not take medication (refuses) and has never had a therapist. We try to convince to no avail.

She had a bug infestation recently and has quite literally been going crazy over it. She thinks the bugs are burrowing in her skin, has done all things to fix the infestation on her own. We convinced her to get professionals to help and the appointment should be booked for tomorrow (it’s Labor Day/ no one answers)

Her behavior is erratic and scary- one second she’s fine the next she’s huffing and puffing freaking out over tiny things like not being ready in time for plans or “not getting any help” ….. the up and downs have been scary, quick, frequent and alarming.

In the middle of all of this, she also has been stuck on fixing family issues with people we have gone no contact with, saying we need to have “sit downs” with them and is offering to fly them to the new state she lives in to help. Point is, this isn’t normal.

My older sister and her currently live in the same state, Minnesota. She also is the daytime caretaker for my sister’s 2.5 year old. My sister and her are the only family/friends/support they have there. My sister is also a single mom and is struggling with how to manage having her watch her son when she’s like this.

Wondering what our first steps should be in dealing with this. We are thinking to have a serious sit down conversation first and seeing if she’ll accept help to begin with. If that doesn’t work, what do we do next?? Thanks in advance!