I suspect Becky winning with a roll up was a way to extend her feud with Shayna despite Becky cleanly winning 1-2-3. Because honestly Becky has no credible threats on the RAW roster whatsoever now that Charlotte is going to NXT... so giving Shayna at least one more shot might be worth their time at least until they build someone else up who can come close to being a threat to Becky. Or maybe if Nia comes back.. that works too.
That said, I do think Shayna loses a bit too often the exact same way. I think she's been beaten exactly that way 2-3 times.