Prison can be a pretty scary place, especially for a 21-year-old girl who's a first-time offender. It's probably no surprise that she wanted to smuggle a loaded gun in there. Y'know, for protection. What did raise a few eyebrows is her method of getting it in there, which was - and we're not making this up - inside her lady parts.
Leaving aside the obvious questions as to how cavernous her cavern really is, the other question is how she thought she could get past the metal detector, even with the gun as snug and safe as it was. It didn't work out for her, either way. She was discovered and charged with introducing contraband into a penal facility, plus additional charges because the gun was stolen. Ouch in many ways.