I hope it all works out. I am in the process of deleting my fb profile. It takes 2 weeks to do that. I had a similar situation as you did with the WhatsApp lady and felt like if I didn't log in every.single.friggin.day people got upset. I decided I'm wasting too much time there with people I don't know and will never know. So awhile ago I created a new account and I'm only following pages with info that's of use to me, like science and health stuff and one other small group. I was starting to get really callous to people's troubles and just feeling annoyed plus all the eternal bickering. And all the people who would be begging for prayers when they have a hangnail or something. Since I'm an atheist it's always been annoying but I guess I just reached my limit.
Anyhow, I think you've been very polite. If she gets offended it's not because you weren't as gracious as you could be.