So she combined the two chapters into one, and pared it down by fourteen pages. That felt painful at first, but she is comfortable with what's gone, and it passed a crucial test: upon re-reading, she didn't miss any of it.
The chapter still doesn't "work," however. It's not badly written, but it needs vigor and coherence. It needs pacing. I've advised her to lay it aside for now and move on to the next one, with the promise to herself that she'll return to fix it when it feels fresh again. She may have to consider actually re-writing part of it, or even re-thinking it at a fundamental level. Although words can feel inevitable or unchangeable once you've written them (Alastair Fowler said they tend to harden, like concrete hardens, if you write too soon), they're just words. You can re-state, scrap and start over, try fresh approaches, anything! And the re-write is usually faster than the original, because your mind now knows what it wants to say, so it's simply a matter of stating it in an engaging and accessible way.