We know she’s heavily invested in Barry and Iris’ nuptials, though she doesn’t actually meet Iris, and it spawned the theory that she’s actually the comics’ Dawn Allen, Barry and Iris daughter, or their granddaughter Jenni Ognats.
It could all be coincidental, of course, but that’s not how things usually work on The Flash.
After all, she shared Barry’s awkwardness, his goofy demeanor, and his eagerness to be helpful, and she shares some of Iris’ physical features.
And we did just have Cecile’s pregnancy take an interesting turn, possibly as foreshadowing?