Low budget zombie movie, with some Found Footage elements

[Blackdragon6]

Ok, so the info I have is REALLY scarce but here goes. It's a Zombie Apocalypse film from I want to say early new 10s. It's low budget, but it's decently made (I think).

The only thing I remember is there being some found footage elements regarding a female scientist in a bunker/lab. Towards the end of the footage she kills her infected assistant but it was a really quick edit of her doing it tho before it quickly cuts back to said scientist with the now dead female assistant. It was literally a blink and a miss of her bludgeoning the assistant. The scientist was explaining everything to the audience.

Most of the movie was conventional tho, I think the lead might have been a younger girl whom by the end of the movie becomes a older woman with a large facial scar (I think). Might have been a time skip I dunno. Keep in my these are all hazy memories and I mostly just remember the segment with the blonde female scientist. How the above description helps lol. Thx in advance

[Blackdragon6]

Also, it's not any of the "Day of The Dead" remakes.

[oogooboo]

could it be one the sequels to R.E.C.?  maybe REC4?
I only saw the first one, it is found footage of zombie/possessed trapped in an apartment building and super scary, looks like the sequels have bigger scope.

[Blackdragon6]

Nah, I've seen the Rec films, loved all of them except part 3