Loss of Faith after loss of Mom

So I'm 25 years old. My mom is 65 years old. She passed away on July 30th, she went into cardiac arrest 4 days beforehand (20 minutes of chest compressions), put on life support with machines pumping her heart for her and then went into multi system organ failure. Fought in the ICU for 4 days and those 4 days were the absolute worst days of my entire life. My partner and I did not leave her side, slept in her room and struggled to even go to the cafeteria to eat. News from the doctors kept getting worse and worse everyday. During that time though my entire family, their friends and even friends of friends prayed non stop that she would recover. Obviously, it did not happen. And now, for the first time in my entire 25 years of living I struggle to pray. I'll talk to my mom all day and tell her how much I love her and multiple times she has talked back to me in various ways but talking to God right now? It feels empty. I can't. All I did for 4 days was pray and she didnt make it through. Is this..normal? I feel guilty like we were given many blessings during those 4 days, like hand squeezes, her mind was there but her body was failing. She knew we were there with her. And I know when she went into cardiac arrest that could've been it. I wouldn't have gotten to say goodbye so he did bless us with that, and I am thankful but I am angry. On a faith-based level, I'm angry. And it makes me feel so guilty