Give her some time to dwell on this. My mother reacted nearly the same (even the lesbian argument was there in our discussion
). The only difference was that she was thinking it was my idea and I would suppress my husband to agree with me and my ideas.
This is a shock for her. She will be able to talk about it when she has made up her mind. Give her the time she needs even if it hurts for now.
Chin up! Sometimes it's the hardest when family is involved. Don't make rash decisions in the spur of the moment and wait for everyone to cool down to talk about it again.
Facts: 30, female, bi, v-type relationship with Sward (husband, straight, mono) and Lin (boyfriend, straight, mono), poly-fi and co-primary.