I appear to be having the same issue, steam version v4.3.4 gamesave started on v4.3.0 I am ~day 240, I can happily send you a link to a savegame? I am playing sandbox, show version, it may have something to do with steam auto updating versions on steam perhaps?
No cheats beyond using character import on myself and one of my companions from a previous version.
I own no fiefs so that appears to make no difference and I have no loyalties to other factions, also worth noting speaking to House Targ vassals I cannot ask them where she is located, she spawns in next to dragonstone, never enters and then sets sail and never lands. When you approach her you have two options, one is to set sail the other is to tell her to surrender which leads to combat where you can only change commander or leave.
Here is an imgur album showing what I mean
a mega link to my save file:
Mega.nz
Thank you for all your effort Prod, I'll continue to support your game because I respect the work you've put in.
weisspure
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