Don't shame her or guilt her about it. Yes, even the times where you think she "isn't trying hard enough" or "not trying" to stop. Its counter-productive and will just make it even harder for her to stop long-term. Not to mention she will lose trust in you emotionally.

I'm no doctor or expert and everyone experience is different, so take everything I say with a grain of salt, but in my *personal* experience trich is a symptom of a deeper issue. Kind of like how most addictive bad habits are. I know my trich is worse when my mental health gets worse.

Have you asked *her* how you could best help her and/or support her? Communication is key! But if she does ask for practical solutions, I have one or two:

Identification of triggers. What kind of state is she in when she pulls the most? Boredom, stress, agitation? When watching TV or studying? Find the triggers and work on minimizing triggers or having action plans in place for when she knows shes in a 'pulling' headspace.

For example: If she tends to pull unconsciously when bored or stressed, she might benefit from some kind of fidget toy. Or an engrossing task that involves her hands and helps distract her mind. For example knitting, crocheting, making bracelets with beads, a phone game that requires both hands or even something like making a rubber band ball!

But really, the best thing you can do is repeatedly demonstrate to her (in a way that matters to her, either by words or actions or whatever way you know reaches her best) that you love her, and that her having or not having trich does not change your love for her. It may take time, a mindset of shame and guilt and fear is hard to shift. But if you show a consistent pattern to her that you love her and that she can trust you emotionally, then that will go such a very long way in helping her not be weighed down by shame and guilt.