I think Lark's advice is really good for your situation.
That being said, you could also make a Witch's Bottle for protection/binding against the ex-girlfriend.
Additionally, some helpful herbs for your situation are Cayenne Pepper, Black Pepper and Salt. You could make little pouches to carry these herbs around with you both for extra protection, or add these to the Witch's Bottle if you choose to do that.
Apprentice..., by which means should I get you your "solid evidence"? How do you prove a psychic attack? There's no way to prove such a thing, and you know that. You're trying to belittle me, and I don't appreciate that. I have already defended my claims and I will do so no more. If you don't have the guidance or advice I was seeking, or even support of any kind, I'm asking you nicely to keep your opinions to yourself. And I'll have you know I went to college for psychology, courses 101, Lifetime, Child, and Abnormal. I am a CNA, and have worked with patients with mental disabilities, and am trained to spot when something is wrong mentally, as well as physically. I am not a paranoid person. I look for logical reasonings to absolutely everything, and when I can't find it, I ask for advice. And that's what I'm doing now. I don't care for those that appear in a thread just to be dismissive to others. It isn't kind or positive, it's negative and downright rude.
If you're entirely certain that she's doing this on accident then basic shielding should be enough, be sure to connect the shield to an energy source that isn't you however so as to make sure that you don't expend too much energy on it.
Other than that this is basically just the evil eye through the internet instead of face to face eye contact so basically anything that removes the evil eye could be used to repel this, maybe you would need to change the wording.
I can also PM you something that would stop her from attacking again if you're afraid of that.
