I'm sorry. Mary is a Jewish mother. There is no way she is irrelevent.
Mary is dead to us.
No one with eternal life is dead to us. Mary has eternal life. She is very much alive.
Mary was a Jewish woman that housed Jesus till He was born. Very little is written about her. She should not be the focus of your attention - and certainly not on Palm Sunday.
Mary is in heaven but like other relatives and loved ones who have passed on and believe WE do not have access to her and we don't pray to them.