I am really depressed to read this post. Now a days these type of crimes are increasing and we must aware to these things. I want to share here a website where you can do DBS online (https://www.dbs-check-online.org.uk/) check of any suspected person. On this service you will get all criminal record of that person very easily. This service will help you to get alert with such people.

Gosh thia is shocking and saddening . May God be with her family