Thanks Delinda, you hit the nail on the head. The lead is in a wait step right now so her activity history isn't showing any flows that she belongs to just yet.
She mistakenly belonged to multiple flows in the past when we deactived her, which I think we fixed at the time. I'm worried though that because these flows were stopped partway through when we deactivated her that she'll pop straight back in to them all when we activate her again.
When we activated her an hour or two ago she popped straight back into all the flows (again!). Thank goodness for the wait step. I manually went in and removed her from the flows she didn't below in, but the popped right back in there just a few minutes later. Argh.
Gosh, I don't know what to do to fix this. Perhaps just delete the record and start again??