Fiancé “deadbeat mom”

So my fiancé mother..

She has took absolutely nothing to do with my baby she is (6 months) all because my parents found out first when she was born, (she was in the special baby unit for a day) so didn’t really want anyone up seeing us in hospital just wanted to sit with the baby.

So because he told her this she hasn’t got involved or anything with us or the baby.

Bear in mind she left him at 5 years ago, just got up and left one morning.. he now 24.

I’m I right to hate this woman as much as I am, I have blocked her on everything. I don’t want her seeing anything till do with us.