Yolanda is a recurring character from Year 2 #2: The Super-Nice are Super-Annoying.
Jamie describes her as one of the extremely dainty people in Mackerel Middle School. When Sebastian starts sitting with her, Jamie, Isabella, Angeline, Hudson, and Mike Pinsetti, Jamie says she barely remembers what she did or of was even there. Near the end of the book, she is shown to have a gift with glitter like Jamie and is a reaaly good dancr, which Jamie says in the book that's not that dainty.
She makes a minor appearance in "Nobody's Perfect. I'm as close as it Gets," revealing she is on the track team.