I know a lot of people hated EKIB, and I'm not going to blame them for it. (I personally believe it's infinitely better than WTAWTAW, which was simply painful)
But I loved Frankie in that episode, and not just because of her love of punk music(Which was hilarious). It really showed her motherly and loving capabilities in full force, with how she acted towards Bendy. Don't get me wrong, I hated that she and Herriman were fooled into punishing the IFs for things they didn't do, and Bendy didn't at all deserve the affection he received. But just seeing that affectionate side of her's in action was something I truly appreciated.
I guess what I'm trying to say is that her loving side is a huge reason why I adore her so much. The mainstream entertainment industry's shift towards the "devil may care" attitude means that it's become increasingly hard to find female characters that have both "heat and warmth"(like Cassini excellently put it), which makes Frankie all the more special.
