I'm so sorry.
Eat and sleep and make healthy choices - don't get hammered like I would. Treat yourself like you would want a friend to be treating themselves going thru the same thing.
If you feel isolated invite friends and family over, join a grief group (maybe), or do community center outings, especially if she was the one to organize the social stuff. People will be there especially the first 6-12 months but you gotta ask. Busy is nice, volunteer, or get a little job if you are retired. Be as strong as you can for your kids. They lost their mom but they will want to help you too.
Funny this comes up because I feel like grief is finally hitting my aunt. I just spent the week with my mom and her sisters...didn't see them because of covid the last 2 years. My one aunt's husband died in late 2019. I think he was 57 and she's about 56 now so she was widowed young. It was her second marriage. She's a little wacky and has had a relatively difficult life so she is always concerned about feelings and contemplating crap. Anyway covid hit so she didn't notice some social changes but her daughter moved out this spring. About a month ago she moved her bedroom into her living room, I think the aloneness/emptiness and the anxiety of being alone is getting to her. My other aunt said this is crazy, my mom said it's chaotic and not all the calm and peaceful stuff you strive for, I asked if she was dating and told her not to bring anybody home because they'll either get the wrong idea or think you are nuts. Why not just put your bed in the kitchen? It makes as much sense. Don't put your bedroom somewhere else is the best advice I can give you.
My other aunt is going to lose her husband within the next 3-5 years. He was on some medication for the last 20 years that messed up his lungs. She keeps saying she is going to move here to live with us or my parents because she doesn't want to be alone and wants to be with people who are fun. I'm so sad for her now too.
I think my mom would be okay. My dad will lose his mind without my mom, it will be something. My husband will be remarried within a year of me dying. I'll be dead within a year without him. He's pissed at me right now though so whatever!
PM me anytime or call or if you are around here I'd meet you for lunch. I can't imagine the loss and hurt you are going thru.