Personally I wouldnt read too much into what happened. Which is natural to do as thats human behaviour for you.

In my personal opinion, no-one can make another have ill fortune through some sort of spiritual means. You can take it apart with questions like:

If you believe in guides protecting you then what are they doing on each side whilst this happens?
If you believe in Karma, what did you do to attract this in the first place and then what did your Aunt? Goes round in circles.
You took personally something you didnt have to, is that your Aunts fault?
You and your Aunt have a view of the world which has been created in so many ways through conditioning from various sources. Why would either of you be punished for that?
Doesnt God forgive? Why would God orchestrate your Aunt to be hurt?
If people could do that then world leaders are in deep trouble and are lucky to be healthy and alive.

It just goes on really. I would avoid thinking you have some sort of super power which can hurt people, I would say thats just ego and I would explore other possibilities like coincidence or something else.