I really want my Mum to have a relationship with my children

But I feel it falls on death doors!

She has got to Start being my child care helper as I'm going to work once a week i need her. She has her other grandchild 2-3 times a week and they all have a bond.

I've said to her a couple weeks ago facetime us get her used to u, but also start popping round for 30mins once a week for a cup of tea as I need to leave her with my child while I work , then today she's like I won't have time today now despite her being over the moon I invited her yesterday as I need her help then hasn't got time rest of week either

Every time I try I jjst feel like what's the point I have no relationship with her , she has the attitude as we are all grown up so it's time for her to live her life as mum and dad now sort of thing