I have been communicating with my niece who live in Kenya and I live in USA, we speak m...

I have been communicating with my niece who live in Kenya and I live in USA, we speak most often via whatsapp* messages and sometimes we videocall. recently she discovered that her whatsapp account was hacked and she started receiving some text and video chats we had even for months ago.*The hackers wanted to know what I do and who I am to her they threatened her that they will send out the text messages they have and video call to all her contacts and to my contacts because through her phone they were able as they say to get all my contacts as well. when she shared this with me I changed my phone and asked her to do the same but we are worried that the hackers still have the information with them.*My question now is if I give you her cellphone number together with my cellphone number will you be able to know who got into her phone through whatsapp and or my phone and delete their accounts?*Kindly we need help from your office*thank you