Sheeva Numbers:
v Scorpion: 4-6 His teleport keeps her from safely following up Jump Stomp with her BnB like she can against other members of the cast. His mix-up options also make it harder for her to block and punish like she can against other members of the cast. This is not as hard as the Mileena match-up, but it's an uphill battle. She can actually zone somewhat effectively with her Fireball in this match-up. She also punishes his high-risk playstyle quite nicely.
v Sektor: 3-7 Up-Missile makes Jump Stomp a non-option in this match-up. His flamethrower negates the reach she can get from using her 3, 3 combo starter. And all of his attacks are faster (We don't have Sektor frame data yet, so I can't say how much faster, but he always seems to beat her out up close). He can also pretty much lock her down on the other side of the screen with Missile. (Obv, she can dash block in, but he can also step back and keep doing it). It's not impossible if she does get in, though. Obviously, she hits hard up close, but getting there is about as hard with Sektor as it is with Shang Tsung.
v Sonya: 3-7. Sonya's fast and Air Drop shenanigans into the 50/50 are brutal. The only thing that makes it not so bad is that Sonya lacks a low combo starter. But she can always Military Stance, F+1 to hit low. Now, Sheeva has to respect that as well as an overhead from Military Stance, Throw. This works against everyone, obviously, but Sheeva feels the repercussions of it harder as she's so much slower than the rest of the cast, she can't really stop Sonya from keeping pressure up even after one of the Military Stance mix-ups like many others can. Sonya's D+4 also trumps Sheeva's D+3, which she can spam against many characters to get them to crouch for a Low Grab. Sonya also has lightning fast recovery on Energy Ring making it impossible fore Sheeva to zone her out. I'd say this match is just as hard as the Mileena one.
I edited this into a former post, but it may have been missed. I know you'd prefer data from Devil Digimon, which is fine; but as I stated before, I'm currently hold the Best Sheeva title of the GameFAQs board (lol- for what that's worth), and I've played several games with Dig on his late night streams. Obviously, his data would be better than mine, but there aren't many people playing Sheeva competitively, so I may be the next best thing ^_^