I could see Layla feuding with Kaitlyn. I think Kaitlyn has made good progress in the ring and Layla is someone that has really upped her game inside the ring over the past couple of years. It might not be the best of feuds, but I think they could both do enough on the mic and they can certainly put on solid matches inside the ring, so I think this feud could have enough juice to be enjoyable.
In my opinion, however, I'd sort of put this feud on the backburner for now and use a feud between Layla & AJ Lee to ultimately get this one off the ground. Kaitlyn could sort of be in Layla's corner, be her back up & generally her friend, just as Layla did for her. During the feud, maybe little things could wind up happening in which Kaitlyn winds up causing Layla not to win the Divas Championship. For instance, once their first match is built, AJ could have Big E jump up on the apron on the opposite side of the ring. Kaitlyn sees this and jumps up on her side to get the ref's attention towards Big E. Layla, at this time, could be gathering her wits after maybe mounting a comeback on AJ after taking a beating. AJ runs over to Kaitlyn and they lock horns on the apron a bit. Layla sees what's going on and runs over to try to separate them only for AJ to sidestep, causing Layla to crash into Kaitlyn and knock her off the apron. AJ could them either lock a stunned Layla in the Black Widow or roll her up for a pin.
The aftermath is a little bit of tension between Layla & Kaitlyn but she knows that she was trying to help. So maybe the build things up for a bit with a promo segment between the two and AJ makes some sort of flippant remark to Kaitlyn which causes her to attack AJ. Layla tries to help a ref or Big E in pulling them a part. As they separate, AJ delivers a hard cheap shot to Layla before she and Big E head out. Layla gets laid out because, again, of Kaitlyn losing her cool. A second title match is booked between the two of them in which Layla asks Kaitlyn to stay backstage. Kaitlyn is disappointed but understands. During the match, something could go down in which AJ cheats somehow and Kaitlyn, who is watching backstage, suddenly runs out and, amidst the general chaos, perhaps manages to get hold of AJ, resulting in Layla being disqualified. Or, Kaitlyn winds up accidentally distracting Layla, pissing Layla off that she came down in the first place, and the distraction allows AJ to capitalize and get the win. As Kaitlyn comes into the ring and apologizes, Layla is frustrated and winds up turning on Kaitlyn and delivers a vicious beatdown before leaving the ring.
Layla blames Kaitlyn for costing her the Divas Championship, which actually is kind of her fault. However, Layla's theory is that Kaitlyn was jealous that Layla was going to be the one to take the title from AJ rather than her. She states that Kaitlyn purposely sabotaged her matches against AJ out of bitterness and frustration because she was about to do something that Kaitlyn hadn't been able to do and the feud just goes on from there.