So I just did Taking Independence twice... I had to reload a save because apparently starting the quest with Garvey as your follower breaks the game and he can never follow you or even talk to you again after you finish it (he will just make quips and stuff in passing, no further dialogue possible).

Anywho I did it the second time, everything went fine... Got the Castle, etc... Built some generators, etc... Everything going smoothly... Or so I thought...

I have been sleeping, fast traveling, waiting, etc., for like 10 in game days now... And the woman who starts the Old Guns quest simply will not appear at the Castle in my game?

Any ideas as to why? Do I need to progress the story quest first? I just went to Diamond City and got Piper, I haven't even made it past the Valentine quest in the main quest yet.

EDIT: Also of note is I go back to Preston often and he doesn't give me the quest either, just the standard dialogue to have him follow me and ask about our friendship...

Thanks