Being invited to an appointment is an act of trust. Your role is not automatically advocate, historian, or witness. It is whatever role she asks you to hold.
Agree your role before you enter
Ask what would help. She may want you to take notes, remember questions, describe one event you witnessed, or simply sit beside her. She may also want part of the appointment alone.
Choose a small signal she can use if she wants you to speak. This prevents you from filling a silence she needs or answering a question that belongs to her.
Help the opening stay clear
Before the appointment, help her choose one sentence about why she is there today. It might be: “My periods are now making me miss work and wake at night.” The whole history can follow after the main reason is clear.
Keep up to three questions visible. Useful questions include: “What are we trying?”, “When should we check whether it helped?”, and “What should happen if nothing changes?”
Add facts, not authority
If she asks you to contribute, describe only what you observed. “She cancelled three plans last month” is a fact. “She cannot cope with pain” is a judgement. The first supports her story. The second replaces it.
Do not use the appointment to reveal private information she did not choose to share. If you are unsure, pause and ask her permission in the room.
Leave with the same understanding
Afterward, compare notes in plain language. What was discussed? What was decided? What is being tried? When is the review? What did each of you hear differently?
If the plan is unclear, help her write the question while it is fresh. The goal is not to reconstruct every sentence. It is to keep the next step from disappearing.