Betrayal

One of my childhood friends disclosed my pregnancy to my mom who I was no contact with. I ended up becoming low contact with my mom after her constantly getting in contact with me after so many efforts of blocking her and other people out. I announced my pregnancy in my close friends when I was about 7ish months I think and my mom told me that my childhood friend brought it up in conversation. My mom said the conversation was about advice in regards to hair so im not sure how or why I came up but she congratulated my mom. My old friend KNEW the issues between my mom and KNEW that we were not on speaking terms, she also knew that I wanted to keep my pregnancy private and only reveal to those close to me. Afterwards my mom told EVERYBODY, she had several family members reaching out to me congratulating me and I was so upset because more than half I haven’t spoken to in years and I wanted to announce my own pregnancy. The friend has been trying to reach out to me saying she misses me (she doesn’t know that I know she told my mom) but I’ve been ignoring her. Should I let by gones be by gones? I just feel a bit betrayed in a way, wondering should I have a conversation with her at least?