OP, please ignore these people.
All children are different.
All adults are different.
These people may be saying this as they actually dont know what its like to have your child for all of their spare time. They probably dont know what its like to have their own kids all their own kids spare time. (And if they do, they need to have a word with the father)
They may have a quiet, content child that just sits colouring in a corner, your child may be full on (our DS doesn't stop).
It baffles me how people give such sweeping advice, everyone is different as is their circumstances. So its never one size fits all.
I love being with my DS, i love the school holidays when we are off together again, but my DH also loves spending time with him, so he will take him off to do stuff. So its not just me.
Please dont let anyone make you feel rubbish, you are there doing it. So be kind to yourself. Can you find places to go where your DC can be off doing something, beavers, rainbows, dance class, footy class maybe ? Give her other things to focus on.