That logic puzzle

I need to vent about the answer to the first logic puzzle from the book from Asher Sorrengail

Spoilers from Ch 17 and beyond!

How was the six letter answer to FIRST LOVE IS IRREPLACEABLE not MOTHER. After we lost Lilith “I can bear the weight of your disappointment” Sorrengail in SUCH a sacrificial way at the end of IF. While Violet and Mira (and presumably Brennan) are having to sort through their feelings about their relationships with their parents, their pasts being full of lies, it seems like all signs are pointing to love being a driving force behind most secrets in Violet’s life.

I was so disappointed in the answer to the puzzle. I mean, I know the literal mantra about a rider without their dragon. But still.

/endrant