I'm not going to show my mom a group text that did not involve her
Did she ask to see this group text in particular?
Yea, she made it pretty clear that she wanted to know about the conversation and be included.
While it is okay to be curious, it is okay to not show her the message since it was not shared with her and the other people would not be okay with other people seeing the messages when they were not send to them. Otherwise people will exclude you from messages if you are just going to share them with anybody.
I think it's going to be fine. I don't think there'll be any issue with her seeing the text.
You do not have to show her the message since she was not in the conversation. This is sort of throwing your other friends right of privacy out the window. As long as nobody is in danger, there is no reason for your mom to have to know about what was said in the conversation.