Is it normal i am being treated differently by a co-worker?

I have been at my job for less than a year. My colleague, a female much older than I, has been treating me differently. She has worked at the company for a number of years.

Putting aside how she may be treating me, I look up to her because she works hard, and I'm sure everybody else at the company feels the same way towards her. The way my co-worker treats me, makes me upset, and I cry about it on my journey home most days. It's making me dread work, which is a shame because I like what I do.

Previously, I was full-time and have recently asked to have part-time hours because of the way she treats me. It has brought on a lot of stress for me, and is now affecting how I feel outside of work.

This co-worker is super, super nice to everybody but me. My partner describes this behaviour as "Stevia" (artificially sweet..). She is kind to my other colleagues, but puts me down and criticises everything I do in front of other co-workers, which leaves me feeling ashamed. I am constantly critiqued and picked at for my work, whereas nothing is ever said to anybody else from her. Things that I have no control over, are automatically my fault. Anything that goes wrong, is instantly my fault, and even when the problem is resolved and we find that the issue was not caused by me, she doesn't apologise. She makes a lot of snide/sly comments about my culture, and makes these non-specific criticisms of general life that are so obviously about me, it's making it hard not to cry at work.

It's such a shame she is treating me like this because I really liked her when I first started. I'm not sure what has happened, and why she has changed her behaviour towards me, and even when my partner tells me to, "kill her with kindness" which I try to do, and not give her a reason to bully me.. but I'm still crying about it. What should I do? Am I being too sensitive? I know others, including my manager, have highlighted her blaming me for everything.. but really is there anything I can do?

Obviously I have thoroughly discussed what is happening at work with my partner. He thinks that perhaps she could be envious as I've been promoted twice since working there, and get a lot of praise from my manager, and other co-workers for having a lot of work on my shoulders. Should I confront her? I really don't know what to do, or why this is happening to me.