Hekapoo didn't rise Festivia, she was given to Eclipsa's husband and after he was devoured I'm sure she was raised by people from the kingdom and Heka probably came every few days which were centuries for her. She takes care of portal problems, who here can deny that there could exist a dimension where 1 day there equals year/s in mewni.
I don't blame her. Just sit a second and think about it, Septarians are fighting and murdering mewmans, pushing the kingdom to it's limit, Queen Solaria stands up and decides she won't let them erase them from history, creates an army capable of opposing the monster menace, then Solaria's daughter comes and perhaps people rumored about Solaria's death being Eclipsa's responsability, to add cream and cherry to the top of that cake, Eclipsa is constantly neglecting her responsabilities and there are stronger rumors of her meeting monster/s, the rumors become true when the King informs Eclipsa left her crown and wand to escape and marry a monster, she is pregnant, put a second on her heels, WHAT THE FUCK DO YOU EXPECT HER TO DO? Everything she fought for to try and help a Queen has been destroyed in a matter of how long? Years? By her own daughter.
Yeah she was gone everyonce in a while, but imagine leaving because your job and dad demands it and when you return you find out the kind of humanoid you were fighting against fathers the daughter of 'the new queen'.
And the Star comes as princess and does the same with Moon's last decade of hardwork.
We can't blame her for focussing on Marco's massive, thick, Diaz, and probably willing to destroy Eclipsa's new kingdom to then go do him in his own house!