Obsession and attachment (unhealthy kind) could be the same thing.

But we all experience amount of emotional attachment to people we love but when it starts being unhealthy it becomes obsessive fixation.

Seeing a person in a public place and becoming so disturbed that you cry and have to leave work and drink is unhealthy obsession that is beyond regular attachment.

I love my daughter and would be very happy to see her in a public place, she lives too far for me to accidentally bump on her but I bump on my mom in public places, I love them but isn't disturbing to me in fact it is always joyous event and we always laugh how we ended up in the same place.

Maybe I would be surprised if my mom showed up at my work (I teach high school so no way she would show up there) but I wouldn't be upset or cry or drink. Why would I?

What you have is unhealthy and she is to blame as she supposed to help you grow not get worse.

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