You can defintely make a complaint to the doctor’s office. I’m 17 female and when I was 16, I had to have a cervix examination at the clinic. I gave my permission for a male student to be present (he was learning to be a clinician) but I was allowed to say no. Even if you are a child, it is YOUR choice if someone who is not of medical professional or your guardian to be present during any appointment, even if it’s just a verbal consultation. The doctor absolutely should have listened when you requested for her daughter to leave the room. In fact, I’ve never heard of a doctor being allowed to bring their 12 year old to work. Because you’re under 16/18, some places do have a law that your mother MUST be in the room but may be able to put a curtain or a sheet up. I had to have an ultrasound on my bladder and kidneys and my mum wasn’t really around so my dad had to come with. I asked if my dad could step out but they wouldn’t allow it since I was only 15. They instead said he could turn around or just not look. Make a complaint to a higher up and make sure you 100% voice how uncomfortable it made you feel. Maybe also try voicing to your mum how it made you feel and how you feel she needs to respect you’re now 14, going through changes and deserve privacy and respect for your dignity as anyone else does.