My mother slapped me and now she's still crying, is this an overreaction?

Anonymous
All this started when my long-distance girlfriend (now ex girlfriend) found out I never had serious plans of moving to her country and having kids. We dated several years ago but that was so long ago. We've been on that long-distance relationship since Jan 2017. She really believed me when I made up some bs story of my immigration lawyer needing $400 for her marriage visa process to be expediated and that I'll pay it back.
Then obviously when she found recently this month, she and her mother called the landline, my mother's cell and well all hell broke looses. She saved all the receipts and other evidence. They forwarded it all that to my mom. Her mother talked to my mom for the longest.

When it was over, my mother really did slapped the hell out of me and started crying. She kept saying I was her only motivation, her life's work, her only reason to even immigrate to the US (she was a pregnant refugee) and give birth to me in New Jersey, etc. She ended with an ''all my life's work and now my ultimate failure''. Ok that was a couple days ago but now she's still crying. I tried calming her down, she said ''Leave me alone. All my work for nothing. I failed you'' and locked herself in her room.

Ok so I did wrong but was my mother's reaction overdone? She was never a horrible mother. She did nothing wrong. She's thinking so lowly of herself. I've never seen her that sad before.
My mother slapped me and now she's still crying, is this an overreaction?
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