Well 2 of her chapters have stealth segments, so if you ace those and remain a ghost, no issues there. On the other hand, if you tend to mess up the "don't get seen" bits, be prepared for some fierce firefights. Her chapter 1 tends to be the most difficulty, since you only have the shotgun to deal with the bees. And there are lot of bees in 1-4. I just tend to rush past them on Pro, since killing every single one is a waste of shotgun ammo.
*Naturally if you are the vindictive type, you can always revisit the stage with infinite ammo on for the Bear Commander and deliver hurt in spades.
One of the boss fights has plenty of respawning zombies though, that's probably due to the fact the devs want to give the player the option of collecting ammo if needed. If you've done some farming in Ada's 1-1 (use those turrets!), that shouldn't be an issue.
But yeah, on the whole her solo campaign is pretty much short and sweet.
all the cutscenes put together make up for 27 mins, if i'm not mistaken, while all the others have at least 40 to 50 minutes of cutscenes.
the campaign itself is also very short, especially if you know where you're going. the difficulty is funny in this one: chapter 1 is the hardest, and after chapter 2 everything gets easier---extremely so.
on my first playthrough, i was beating it on pro and died a lot, but still managed to clear her campaign in 3 hours or so. some chapter i managed to beat in under 30 mins without that being my intention.