There are a couple of things you can have your mother try before mailing her kindle to you, or if she's already mailed it you can do it.
1) Check for indexing problems - From the home page do a search and see if there are any books that are stuck indexing.
2) Restart Kindle (not factory reset) this should restart the kindle and any processes that might be stuck without deleting anything:
From the home page press menu, then choose settings, once on the settings page press menu again and choose Restart.
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