Use caller ID spoofing. You can call her and have her phone tell her that it’s her mother calling. This way she’ll answer…. You can keep changing numbers. If she turns her phone off obtain her IP address and perform a DDOS attack so that she no longer has access to the internet forcing her to turn her phone back on so she can go online using LTE and then start calling her again.
Or you could give her space and let her come to you if she wants to talk lol