1- Be patient. Such matters take time. Don’t bring up topics that cause tension with your mother. If you do, find an effective, soft approach. It’s very difficult for a person to change his/her beliefs. It takes time and effort.
2- Do sujud for several minutes each night and with a deep breath each time say: سبحان ربي الاعلى وبحمده (subhana rabbial a3la wa be7amdeh)
3- Before sleeping, say 100 times لا اله الا الله (la ilaha illa allah) and take a deep breath each time
4- Read this Dua:
http://www.duas.org/mobile/sahifasajjadia-dua54-removal-of-worries.html
5- Read this Dua daily:
https://www.duas.org/Amn.htm
May Allah facilitate it for you.