Should I convince my mother to switch to ProtonMail?

Hey, My mother is a non-technical person, she's a sole trader. She has been using Google services for many years and is probably used to them. A few months ago, I was able to convince her to set up an online password manager and calendar (up until now, she had been saving all her passwords in a handy paper calendar).

Should I convince her to withdraw from Google services? If so, how should I do it so as not to put too much pressure on her?

Thanks for all the answers.