My mother has passed away, and I feel it’s my fault

My mother passed away around Wednesday from a sudden heart attack. She was never sick before, always full of life and almost 40 years old. She was small like a young girl, even with two grown kids, but recently she gained weight, fell into depression, and had weight loss surgery because family kept pressuring her about her weight. One risk of that surgery is fast fat loss, which can harm your arteries and heart. She used to be very depressed, often saying she would take her own life, but I reminded her it’s haram. She’d reply, 'It’s not like Allah cares; I don’t pray anymore.' She was the most religious person I knew, until the depression hit. She never went to therapy, just relied on anxiety pills, but in the end, she passed away peacefully without pain. Has Allah forgiven her? She missed her late father so much. Just minutes before she passed, she seemed to know, and she told me to be there for her ghusl, take her phone, and gave other instructions. It’s been about 40 hours since burial. What’s her state now? Did she answer the angels’ questions correctly? Was the angel of death gentle with her? Is she with her father, talking about us? Is she happy? Is her body safe? She’s buried near a mosque wall; I pray nothing harms her beautiful, precious face.