Hey there sweetie, It is great that you are so concerned about your mom, but try to relax a little, hopefully she will do fine. I am a breast cancer surviror.
I was 36 when diagnosed and am now 51!!! If you get it in the early stage there is always hope. It has made me appereciate so many things so much more now.
I looked after my mom, she had a chronic fatal disease and it took her about 10 years to die. That may sound terrible, but it was so devastating to watch that I prayed daily that God would take her. Some days I thought I'd never cope, I also had a todler at the time, so I understand where you're at. Things do work out and we do get through it. I t all just makes us stronger. I know you don't think that at the moment but believe me, you will cope.
I must add that although I prayed for her to die I was shattered when she did. She was my mom, my friend, my everything. I still miss her 15 years later, but now the memories are good.
I will say a prayer for you and your mom. Slow down, breath and take one day at a time.
Hugs to you. God bless for being a caring daughter!