I would have immensely preffered her to not get a dog in the first place.
It is very well known that many many shelter animals have issues. They cost a lot, need a lot of training and patience and room to move and a safe space like a kennel to hide in.
Often behaviourists and other outside help.
Apparently she gave no thought to this, decided in 10 days no less that she couldn't cope, a tiny bit of thinking would have seen her not get it.
And to compound all of that, stress on the dog might mean it needs to be put to sleep. Dogs need security and not getting that security time after time is terrible for their behaviour.
If she cant cope with that one, she did the right thing, but to go get a puppy is not the answer. How long will the puppy last, 2 weeks?
Btw I detested her from the grenfell fire, she was telling other people to have displaced persons from the fire in their own homes. But when asked if she was going to take some, ah, no, not her.