good HD options for a small-statured single mother?
I would never use a biometric safe. They seem great in theory. In practice, they're almost more likely to stall you in getting the one object that could save your life in the critical moment than they are to open up without issues. A quick google search will show you exactly why this type of safe is a bad idea.
If you insist on an electronic handgun box, get one with a combination. I'd recommend getting a mechanical combination lockbox instead, however. No batteries to die at the worst possible moment.