Why hasn't Grace and Lucy's mother got any idea what is going on?
This is an interesting one because so far the mother is quite a shadowy figure to me, although she has appeared in a few scenes.
While she is intensely interested in Grace and Lucy, she doesn't understand them. She has idealised them both, but in different ways. Grace is the ideal 'good' daughter. She is expected to behave well at all times and act with a maturity beyond her years. Lucy is the idealised 'spirited' daughter. Maybe taking the place of the relationship Pam would have had with her son if she had let herself. Lucy is allowed to get away with nearly anything because she isn't naughty - she is 'spirited'.
He doesn't know he only has nine lives. He's got through the first eight pretty quickly by getting stuck in trees, falling from great heights and having arguments with the local dogs. And now his luck has run out.
Marmalade jerks himself upwards away from the splashing water, but as the baying of the boys gets louder and louder the one who's got hold of him exectues a huge arm sweep and throws him right into the middle of the river.
This memory will stay with Lucy for ever and she will always partly blame Grace for not letting her jump into the water to save her kitten. Anger at Grace helps her to distance herself from her own guilt and grief.