There are two things here. One, I wouldn't feel too sorry for her money wise because she could sell that mansion they lived in, gadgets and all, and be set up for life.
But companionship would be a big issue. The company of the brother only goes so far But as previously mentioned, she is young enough to meet someone who would accept her (and her millions) as is. Either way, after getting over the huge grieving period she obviously will go through, I think she comes out fine.
Of course, the story sets up the idea that Harold "shelters" her and her mother thinks of her as very self-reliant (even if she keeps Harold's secrets from her). And between the two of them, her mother seems to be pretty right.