Used the console to allow marriage with Alva and she seems to use a more unique dialogue than most. "Leaving? Take the world by storm, dearest" beats "goodbye my love" any day. I know I must have missed other characters who use this, but until now it had always been the same for me.
No. If you enter her house at night you only kill her guard and if your lucky she survives the cave (She sometimes goes there and the vampires kill her). I guess if she did die in the cave you could just find her body and resurrect her as she is non-hostile.
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