exactly this! it might be different if Louise never did anything just with Darcy, but Pearl is regularly left at home with Liam while Darcy spends time alone with Louise - even to the point where they have been on holidays together without Pearl, including to Disney - so why shouldn't Pearl have the same experience with her mother? it's not even as though Louise specifically went out of her and booked a holiday which excluded Darcy - as she did when she went on holiday with Darcy and left Pearl behind - it was gifted for specific dates, and totally coincidental that Darcy was going to be away on holiday with her dad. if she had simply been spending time with Matt at home, I'm sure they would have altered custody so that Darcy could go on the Disney holiday - but she was already going on holiday herself, so she was hardly missing out. and it's not like it was a magical once-in-a-lifetime trip, as they all go to Disney fairly regularly.
and from Pearl's perspective, she must be aware that Darcy goes on holiday more regularly, as she has separate holidays with both her mum and her dad, whereas Pearl doesn't go on. individual holidays with her own dad - which is entirely understandable, but not necessarily in the kind of a young child, who will simply see it as her big sister going on holiday without her, while Louise never books holidays/activities/days out - unless they're gifted - when Darcy is with Matt, because she doesn't want her to feel left out. i can see the situation from the perspective of Louise, Darcy and Pearl, but ultimately, as. a result of the situation, Darcy is the one who has more holidays and day trips etc - so it's not fair for Pearl to miss out on a holiday she'll love just to sit at home because Darcy is having fun on holiday!