“Betrayed by an app she had never heard of” – How TrueCaller is endangering journalists May 29, 2019 https://ifex.org/serious-privacy-concerns-raised-about-the-app-truecaller/
Come on... With her job, she shouldn't even use classic messaging and calls. VOIP + Encryption + VPN is a must-use. This case shows the ultimate truth about privacy and security, you can secure yourself like an ultra-paranoid, you can't control what is out of your reach (people, sites, etc...). So do things simply but efficiently.