For Applejack and Starlight in particular it’s pretty special. Given for Applejack, it’s the first time in a while she can celebrate this day without feeling as sad and lonely compared to her other friends about it. And as for Starlight, well… it’s kind of the first time she can ever celebrate it. As she’s never known who her mother was til’ recently. (Keep in mind once again that this is an AU. Particularly one where the Equestria Girls films did not happen. The Sunset of this universe was killed just a little over 2 weeks after Starlight was born. And if this Sunset had still been alive, she’d be about in her 40’s/late 30’s, about in-line with the other mothers I imagine)))