Has your toddler ever run away from home?

Since I don’t have children, I thought I’d ask the collective about a parenting issue.

Is it difficult to keep a three year old child in the house?
Do you have tips on how to secure the residence?

This happened in the past with another neighbor. Now my other neighbor’s child is naked and in the street and even on the roof once. Today I heard her (the child) yelling at me from another yard where no one’s at home, and she’s naked and alone again.

Of course I take her home, text her mother, and stay with her, (I adore the kid) but at what point do you start worrying about neglect rather than it being a rare occurrence?

I’ve talked to the mother quite a few times, since I’m the one bringing her home, but she just acts bewildered, and today said “How did she get out, I locked the front gate?”

I’m considering a talk with the dad in case he isn’t aware.