I do believe in God, & I’ve been thinking about what I learnt about death and God’s judgement growing up catholic. My mum still prays for deceased relatives who were/are supposedly in “Purgatory”, the place you go when not deserving of hell (eternal punishment), but aren’t entitled to the “eternal joy of living with God”. After a time in Purgatory repenting, souls can potentially move “up” into heaven. The prayers of the faithful still on earth can speed this up - hence mum's daily prayers.
Personally I think the idea of purgatory is to give hope to believers who might otherwise worry about eternal damnation if they feel undeserving of heaven.
IMO if there’s a hell child murderers are dragged there straight away with absolutely no hope of redemption.
I’ve been to church this morning funnily enough - it’s my daughter’s 15th anniversary. Undoubtedly (I’m biased) when she faced God’s judgement she went straight to heaven, and one day (after repenting my many faults) I hope to join her there! That hope certainly helped my sanity in the early days.
The OP should listen to her mum and hopefully find peace moving forward.
All my own opinion - please be kind!!!