How does she discover her boss has embezzled millions but somehow not end up with empirical proof of this? Why does she not just go to the cops? Whatever it is that she’s seen is enough to convince her that this is what’s going on, so it’s gotta be good. I’m definitely not saying this is all impossible, but since she 100% knows this is going on (based on the logline), I would struggle to believe that she feels the need to take it into her own hands at this point. It seems a little “because plot” to me.

Ignoring this element, another issue – in both Richiev’s and yours – is that the boss hiring a hitman is something the audience sees only. We know that the boss has hired a hitman, but in order for that to be an inciting incident for her, she needs to know that this has happened which wouldn’t be at the moment of hire. In order for her to proactively seek her goal, the inciting incident is then when she learns the hitman is after her. This is a discovery probably reserved for later than Act 1 though. I’d suggest perhaps a midpoint reversal? First half of the film is a mystery, second half a thriller?

With all this in mind, I think you could easily tie it all up by having her simply not know who is embezzling the funds. The first half of the film is her trying to figure it out, then at the MPR, she discovers a hitman is trying to take her out because she’s getting close – upping the stakes considerably. I’d also consider, for a nice twist, that it’s not her boss (although that’s who she suspects all along) but perhaps someone closer to her who she confides in… perhaps even closer than that… does she work alongside her husband…? Food for thought. My point though, is that by removing that certainty of who has has stolen the money or just the certainty that something suspicious is going on, things click a little better into place. Going to the police on a hunch is a wasted effort and much more believable, but say it was actually the person close to her whom she had confided in who convinced her that going to the cops is a waste of time, and you’re now making things way more interesting character-wise.

I think there’s definitely an interesting plot here. Keep going! Hope this helps.