Am I wrong in this situation?

My girlfriend’s family is holding a new family tradition and reunion and I wasn’t invited. She said she wanted this to be family only because it’s the first time her family has been together since the funeral after her dad passed away two years ago. We’ve been together a year and were talking about marriage and a family, but I felt so excluded, I’m having doubts. When I asked about why, her reasons were that we weren’t married yet, that she regretted involving her last boyfriend in so many family events since it didn’t work out, and that me being there would ruin her chance to grieve her father. I know most of her family already and this would have been a great opportunity to learn about her father and meet her last sibling. Is it unreasonable to be angry about being excluded?
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To be clear, her family wanted to meet me at this event. It was an apple picking event and not a grieving time for the rest of the family. It was all the siblings, their spouses and children.
Am I wrong in this situation?
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