Element Home pricing might be better for you if you have a few friends who are also interested ($10/month for 5 users), and won't use bridges [2].
[1]: https://matrix.org/blog/category/this-week-in-matrix#element...
Lower the stakes and the expectations. Even if she is starting conversations with you on any other app, you can still start the conversations on Element. There will be bugs and quirks she will find, you just offer help and ask her for patience.
With time, they get used to the app and will be okay with starting the conversation with you there.
That's what I did with my wife, my parents, closer family and friends. Then you get one day like the recent Facebook outage, and they will come to you to ask if you can help their friends to sign up to it.
Slow and steady is the way I found to run this race. I already managed to get rid of WhatsApp and Messenger on my phone, it's only telegram for the odd group chat that is still resisting a full change.
The plan I'm on pre-dates "Element Home" and sits at the same price-point.
Unfortunately a side-effect of the split is that I can't use the new bridging product without moving back to a shared domain, and the billing model for bridges on custom domains really doesn't work for consumers, at $0.50 per month per person who talks to you.
The newer products are good upgrades for someone on the regular matrix.org server, but not so good for people who already upgraded :P.