Live $200 low flush on river vs donk jam

Do we have any history with BB?
In a vacuum it feels like they have to have a better flush a lot of the time but we don’t play in a vacuum.
We need reads to make the call, history of seeing them over value two pair hands and straights on flushy boards. We’ve all played against opponents where we would high five the dealer and snap call in absolute certainty that we were right. (We’ve all been wrong about that occasionally, but not often enough to stop doing it).
Do they over bet pot much? What did they have the last time?

Without reads and the table flow I’d fold. Better to make a wrong fold and have 50+ BB left than a wrong call and be down to shove fold levels.

Could she have a str8?

I tank folded, she shows QJo no heart!!!