Good grief. Here is why this is a terrible idea:
1) she is crap with animals and therefore every point below would make a bad situation worse.
2) the eggs that don't hatch
3) the eggs that hatch but die shortly after
4) the no guarantee of all being hens. They could all be cocks (don't go there, I'm being technical not rude
)5) what will she do with the male birds? More than one and they'll fight to the death when they mature. So you have to get rid of all but one anyway. But they're noisy. So bleeping noisy. And then you'll have broody hens and end up with more chicks than you know what to do with. And a cockerel that will potentially chase and attack anything he sees as a threat, including the dog and the kids.
6) for an experienced animal keeper, hatching and keeping chicks is a challenge. This would be a disaster from start to finish if she did it.
And those boys are too young to understand any of what is happening anyway.
100% implore them to not listen to this comment.
Edit to add a 7th point - she'd have to build a bigger run as the 3 she has are cramped into that tiny thing as it is. And we know she won't do that as she couldn't be arsed to do it for the 3 she has in the bare minimum space recommended. It's not like she's hard up for cash.
might help her in the long term though.
