I'm guessing that the summon will deplete its power and disappear.
Killing something like that would give a huge power boost, which probably isn't where the author wants to go.
Holo as an auntie makes sense, given the relative lifespans of elves and humans would mean she'll be around for Lily a lot longer than Weiss, but that same factor makes her a bad romantic interest.
The MC feels like one of those non-characters people create for DND who has to be persuaded to help the party at every step.
If your character doesn't want to be there, why should the audience?
Damn, that's pretty awful regarding your laptop.
If I might make a suggestion going forwards, have an external hard drive you keep all your important stuff on.