This is really minor vs. sheik but hey it all helps. Also if someone already mentioned this, my bad (ike forums have a lot of love
).
If you get a grab at 0% (and this only works at 0%), you can up throw non-sweet spotted Bair to send her into non-tumble hitstun. Sheik will then fall to the ground and land upright. If you fast fall l-cancel the Bair, she is now frame trapped for a regrab. This nets you holding sheik and 21%. Now I find it's usually best to just u-throw nair to put her at 40%, but you won't be able to juggle. If you want to try for the juggle, she needs a little more percent, so two reps of d-throw (relies on her using bad di though) with some head butts puts her high enough to u throw nair/uair juggle.
I know this is getting long, but the key on the first uthrow is to not hit the sweet spot. If you do, she goes into tumble hitstun and it's hard to follow up with sheiks great tech roll (unless she misses the tech, free jab reset). If she di's behind you or no di, it's easy to hit with the arm/blade/tip, but if she di's in front your forced to do a reverse Bair. However, it is still possible to hit with the blade on a reverse Bair, the spacing is just tight.
Pretty niche advice but I get a lot of mileage out of it vs the sheiks I play!