How do you ask your mum to be more involved in helping with the baby without hurting her feelings?

You can simply tell her that mummy, you please do this or that since you are experienced and I trust your style of doing things for the baby than even myself. This way, she will happily take on more things. Also, if she is your mom then I do not think you have to diplomatic. You can straightaway tell your mom that I want your help in this, please see. In this state all that is most important is how old is your mother. If she is healthy and young then you can tell her to do things without any guilt, but if your mom is little old, you yourself will feel bad in making her do things for the baby. I think being around the baby is also so much of a help as then you can do work in the home, else you have to be around the baby so that she doesn't feel being alone.