She doesn't have a floor-specific workout, or section, but she does have them peppered throughout the end of all her lower body-specific workouts.
LB 1 has hamstring roll-ins and leg quad lifts (which are OUCH)
LB 2 has forward-hinged hip abductions (in the bonus as you mentioned)
BP Legs has side-lying hip raises (main workout) and pizza press (bonus)
I kind of like that she didn't just exclude these moves entirely and only do a separate dedicated workout for these.
The bonus sections are usually so short, too, that for me (at least) I find it easy to just add them on.
I also find that the mobility workouts also do a decent job of targeting our lower body joints in an effective way that will assist with strength and injury-prevention, too.
I'm not Cathe, though, so I can't speak to "why" she did it this way.