Rianna Soliogn, aka Gale, has a mistake in the beginning of her stat block where her levels/classes are listed.
It reads, "Rianna Soliogn, 6th/24th Elvish Druid/Fighter/Hero"
For one thing, her race should not be listed in the above line, since the placement is confusing, and it is already listed correctly below, between the listing for her gender and CR.
Secondly, of course, is that she should only have two classes listed, since she only has two sets of levels. Given that her hit points are "6d8+24d4+150" we can ascertain that the "Fighter" listing in her class/level line is in error, since the 6d8 is the Druid hit dice, the 24d4 is the Hero hit dice, and the 150 hp is from her Con bonus.
Incidentally, the correct way to list hit points is to present bonus hp from Constitution with each group of class hit dice, not altogether at the end (all of the NPC statistics in the book have this done, and, in some cases, hit dice of different classes is also added together when the die value is the same). E.g., Gale's hit dice line should read, "6d8+30 plus 24d4+120; hp 236".
Gale's hit points are also very slightly off. 6d8 is an average of 27 hit points (4.5 times 6), and 24d4 is an average of 60 (2.5 times 24). Add that to 150, and the result is 237, not 236. Assuming Gale was given maximum hit die for her first level like a PC, then her hit point total should be either 240 (first level was Druid) or 238 (first level was Hero).