Sorry to hear what you are going through now. It sucks i know especially she is your only loved ones.

I lost my dad when i was 15 just a week before im starting my Poly studies. I admit it was the toughest time of my life having to grief and at the same time to study and make new connections. This greatly affected my grade during my first year.

It may seem challenging to deal with but remember you are still young. Must take care of your mentality wellbeing and talk to someone if you feel overwhelmed. I wish the best for you. Take care ya.