Eternal Rest be granted to your mother and I sympathize for your loss.
It interests me that so many Christians are confused that humans somehow become angels. Angels are sparate beings and have their own heirarchy. Human are above angels in God’s sight because Jesus loved us so much He redeemed us - the fallen angels weren’t redeemed. I get annoyed in It’s A Wonderful Life when they get that wrong with every time the bell rings. Humans remain human and will be raised up on the last day.
PS - we can pray to angels for the intercession before God too - they are certainly alive!!!
sparate = separate (mea culpa)