I think there is a balance to being a good mum and the definition changes in each family.
A good mum learns with her kids and doesn't already think she knows everything. Each kid is different and there needs to be allowances made for them to have their own personality.
A good mum gets to know her kids...does not make assumptions about them.
A good mum remembers that she is raising the adults of tomorrow and teaches the kids life skills...cooking/cleaning/manners/budgetting/planning/self reliances...both boys and girls need all these.
A good mum find a way for needs to be met and wants to be considered.
A good mum makes sure their partner/husband/friends treat them and their kids with respect. They model how good relationships are managed. They make sure that their kids grow up knowing about respect/honesty/love/kindness.
A good mum boosts their kids confidence and resilience. They teach them how to talk to others and allow them to follow their passions without filling them with false pride.
Mainly, a good mum will do her best...but also allow her kids to see when she makes a mistake and say sorry when she does. A good mum will show her kids manners..and say please and thank you to them. A good mum will listen...try and get to know some of their friends...not degrade them or insult them.