I doubt she hates her late brother, any more than any widow who sells off or throws away her late husband's computer collection after his death (which occurs so, so often that it is probably the normal outcome after the collector's death, as opposed to an exception) hates him. It's disinterest.
Most late husbands don't leave an endowment big enough to cover a potentially perpetual upkeep for their collections either, but Allen wasn't most people, and he personally was significant in the history of computers obviously. Normally, I'm not a fan of these extremely wealthy people setting up dead hand organizations like charitable foundations to affect society after their death, but museums that preserve aspects of life from their times and information about their lives seem like a pretty good use case.
I doubt she hates her late brother, any more than any widow who sells off or throws away her late husband's computer collection after his death (which occurs so, so often that it is probably the normal outcome after the collector's death, as opposed to an exception) hates him. It's disinterest.