Thanks for all the advice and wise words.

I think I will keep the tree. I agree that educating my daughter not to eat
anything in the garden is the best approach. So far her main gardening
activity is digging up worms and snails and 'cuddling' them.

(She is always supervised in the garden and whilst of course it is 'my job'
to do that, one does occasionally get distracted by the odd weed that needs
tending...)

Thanks for advice and thoughts!
ROSIE