There are other methods.
Besides spells or rituals, find out two things the target personally enjoys, and that would be even better enjoyed together.
Put one substance of two substances on each one, that when breathed or ingested together would cause death. Perhaps ship by cash on delivery for an added insult.
Whit his attitude towards people in life, it would be truely unwise to think of him not being able to accomplish unspeakable acts. This he has proven himself at, and this is what constitute to that he is dangerous.
As someone who has had this happen, I think the best thing she can do is get a gun and learn to use it. Mundane not magickal, but it won’t happen again.
Efficiency. I take no pleasure in dealing suffering, but if they have to go they have to go. If a person is so dangerous to me that they need to go then why would I take my time and risk the fucker hurting someone I love or myself while I play with him like a cat?
I fell like one of those herbalist in the Medieval period who got accused of witchcraft (although in this case I do practice magick) even thou one was innocent of ever doing anything remotely related to malevolent acts.
Unless I declare myself a Muslim I will get a free pass.
Freedom… it was once something in Denmark. Now it’s piss and vinegar.
Try the “two minutes of hate.” Also, try Xaturing to screw up his travel plans. I know this sounds “fluffy bunny” but maybe have the girl send him telepathic love. I realize he is a piece of shit, and deserves to be punished for bad behavior, but that might stop him from leaving England. Priority to keep her safe. Maybe do all of it?