> the work involved would outweigh any benefit to her

Yeah, name changes can be a pain in the ass. Not just the name change itself (which, depending on jurisdiction, might actually be fairly simple), but in updating anything else in your life (like perhaps a bank or brokerage account, or real property title) to reflect your new name, not to mention any process that requires you to link your birth certificate or other pre-name-change document to your current identity.