What if Leida Mothma ends up in the same place as her mother by taking a different path
I think this would thematically be the most appropriate ending for her story. She tries to focus on herself as a wife and mother, trying to be as different from Mon as humanly possible, she has a child, she plays the part of a Chandrilan wife, and seems like she succeeded in getting as far from her mother as possible.
The following is purely speculation, but from a thematic viewpoint this feels like it will be the most appropriate way to take her character:
Then her son decides that he wants to join the youth legislators program now that that's been revived under the new Republic. Then her son becomes the new senator from Chandrila. For a while he is the obvious parallel to his grandmother, becoming a secret backer for the Resistance in the New Republic Senate. Which means that he's killed on Hosnian Prime when the first order destroys it.
Leida watches, has enough time to process that her son is dead, enough time to do the traditional grief for her people, the wailing and rending of clothing and the tears and all that, which turned to screams, which turned to throwing things, which turns to punching holes in the walls, and she's standing there with her throat raw and the room that she was in destroyed, and she decides that she'll kill them all, Snoke, Ren, Hux, she wants to feel their throats between her hands.
But she can't do that, obviously, and so she uses the contact that her son gave her, the contact that she thought she would never need to use, and, days after the Battle of Crait, gets into contact with General Organa and offers the entire Sculdun family business interests for the logistical operations of Resistance.
She promises that she'll never be her mother, and ends up one of the leaders of a rebellion. Because the First Order killed her son and she wants revenge