If I were her, I would so immediately copy the ebooks that are available again, for now, then find a way to free them from DRM and close my Amazon account myself.
Then I would go lobbying for a law that would make it a legal requirement to make digitally restricted products available to the user in unencumbered format if the user's account gets terminated or if the company goes out of business. So, basically the user would buy the song/book/movie but hand over the appropriate storage to the company for as long as the account remains open. Then, if the storage gets shut down the user would still own copies of his/her files.
Then I would go lobbying for a law that would make it a legal requirement to make digitally restricted products available to the user in unencumbered format if the user's account gets terminated or if the company goes out of business. So, basically the user would buy the song/book/movie but hand over the appropriate storage to the company for as long as the account remains open. Then, if the storage gets shut down the user would still own copies of his/her files.