she should pay attention more to the other two too, yeah.. but also i like that the conflicts are realistic? among siblings there is bound to be some sort of envy—usually when you're still young and all but. they've only welcomed ashley as a new addition to the family pretty recently so they didn't get that, huh.
personally, i think mildred is really concerned about their financial situation (well, as she should be) and that's why she keeps on pushing ashley to be cinderella. because their statuses will increase the moment she marries the prince and to mildred it's something fool-proof, 100% gonna happen. would rely on iris and lily too if finding a suitable husband isn't hard (as she said/as far as her knowledge goes, men around them are too old, poor or taken haha). in matters of why she's paying attention to ashley so much—i think it's unrelated to pushing her to be cinderella and more of a "this kid is a klutz" vibe. hard to leave her alone, yknow. it really is too bad that mildred is only one person...