M., please find a doctor you can trust and do all the research you can. I wish I had the information that is available today about Bi-polar which shares some of the systoms of ADHD. I briefly share my story so you don't find yourself where I am today with my daughter. From the time my daughter could express feelings we noticed her sudden mood changes. They can even be seen in family pictures and videos.
My daughter is now 20 and when she was younger the information I searched for just didn't come together and the doctors were not too familar with these issues. The lying really threw me off track because with the information I found it didn't connect to bi polar and its other systoms such as the mood swings at the time. The lying only got worse and I felt there was no where to turn. My family and I sacrificed so much as I felt I had to be able to be available to my daughter 24/7. My other children especially my other daughter suffered from her lying. It affected our community inaction because her lies spread. My husband ended up getting transferred when she was 18 and senior in high school. We are a close Christian family and now that she was about to be out of that high school cruelty period we thought she was growing out of the lies, but later we found out it was being new to the community that we didn't know anyone, so we were just not hearing the lies she was telling at high school.
She got pregnant four months later, told many lies there as well, the father and she could have had a good relationship except she destroyed that relationship with lies too.
The lying is destoying her life as she does this and makes bad choices in her life. It is amazing now that I am finally able to find the help I need, now the problem is now that she is 20 getting her to the help she needs and being extremely concerned for my grandson's care from her. She did some abrupt changing in the past month and like up quit her job and moved in with a man she knew we were very concerned about, and taking her son who has only lived here with us. She lied and hid things from us and we had thought she was doing well and then "slap" there it is. She didn't out grow it after high school. Sadly it is that I can research and find exactly what I have always been looking for and then look back and put things together today and much easier than living in the midst of it all those years.
She was on medication that did help but she became pregnant and we were not sure of its affects on the baby at the time so she stop taking it. So she hasn't been on it since. I am a health freak and like you I am not too keen on the idea of medications. But you need to realize that there are possible levels in your daughter that are lacking, like with my daughter possibly serintonin levels in her brain that are not meeting what they should and it causes my daughter to lie among other things. I tell my daughter it is like a diabetic who needs insulin and has to take a shot to replenish it. There is nothing to be ashamed of, it is honorable to get the help that is needed.
I hope that this has encouraged you to be open to more options in helping your daughter. I will keep you in our prayers. Good luck.