AITA for not comforting my sister after our mothers death?

Basically I 22F have been grieving the death of my mother who passed away in 2021 of Covid. My sister 50F has been having a hard time coping with the loss. I know the age gap between us is large and that is because my mother got pregnant with her as a teenager and pregnant with me in her mid 40s we have done an ancestry dna to confirm this.

When everything happened I had just barely turned 20. I was still living with my mom and when she passed I inherited her house as well as a rental property. My sister didn’t inherit anything because my sister had already bought a house went through college got married and had a kid. My sister took the death hard and essentially shut down and needed tons and tons of consoling for months.

She was having a really hard time so I understand why she never asked how I was handling everything. She started acting out by consuming more alcohol and being wreckless. I distanced myself from her to cope with the death and learning how to handle a household on my own and still have. I work and attend college and I’m trying to move forward with my life. She still continues to act out 2 years later and says that I don’t even know her anymore and almost got committed. The family thinks part of her not being able to completely mourn is because I haven’t been as active as I should’ve been.

TL;DR Not being super comforting to my sister resulting in her acting out.