Ronnie Shaw is one of the few remaining veterans of the Minutemen, and has been around since long before Preston Garvey, Colonel Ezra Hollis or even General Becker around since 2240 known to be earliest. When General Joe Becker was killed in 2282, and the agencies took over she gave up being a minuteman for a time. But she will join up again if the Sole Survivor becomes general.
She explains to the Sole Survivor that, despite Preston's hasty decision to promote them to general, her respect must be earned and isn't going to come just because of a title, as she's seen many Minutemen leaders come and go already. She is presumed to be third-in-command after the Sole Survivor and Preston Garvey.
PCPlaystation 4Xbox One The player character may be unable to assign or trade with Ronnie after completing Old Guns, talking to her only opening her inventory (like generic settlers). This bug may happen if the Radio Freedom bug occurred. [verified]
PC If this occurs, it is possible to restore her shop functions by assigning her to a constructed weapon shop after using the console command setpv bCommandable 1 to allow to command her in the workshop view. Fast traveling away from the Castle and back may be required before the console command's effect works, but once it does, she will resume her former dialogue and still offer her unique inventory, including laser muskets and The Last Minute.
PCPlaystation 4 When choosing the option to brawl Ronnie may permanently become hostile. After about 5-10 seconds she will draw her weapon stating "You're no Minutemen." Ronnie and the settlement will become permanently hostile forcing the player character to kill them all. Ronnie cannot be killed as she is marked essential. She will go into downed state, but when she regains her health she will once again become hostile. If this happens the player character will not be able to continue the quest Old Guns.[verified]
Reloading a save will not prevent this bug from occurring. The game must be closed completely (quit to desktop) and restarted to prevent this bug from appearing again.
PC It is advised not to build structures such as foundations before Old Guns, due to Ronnie's navmeshing not being aligned with what will be built to her final destination before throwing smoke grenades.