#3 Maria Kanellis and The Bella Twins
Maria Kanellis made her return to WWE in 2017 after an absence of 6 years. The relationship between her and The Bella Twins was quite cordial until the whole Dolph Ziggler fiasco happened.
Allegedly the hatred for Maria stems from a moment backstage where Kanellis was dancing with Dolph Ziggler, a man Nikki was dating that time. This didn't go down well with Nikki, and she approached the officials at WWE to convince them not to re-hire Maria after she had been away from the company for a little while. What followed were a lot of shoot interviews from both sides, and Maria was eventually released in 2011.
Maria revealed in an interview about how she apologized to the twins:
I apologized to the Bellas for everything that happened and that was it. I talked to them (the Bellas) and decided you know what, water under the bridge and that's it. I guess I could be angry forever, but I'm not going to be (laughing). Because there's no reason for it. I don't want to be angry or upset because I don't know.
Both Maria and the Bella Twins were honoured at the 25th anniversary of Monday Night RAW among other female wrestlers. Maybe they have buried the hatchet, but nobody knows, at least not publicly. It could've acted as a great base for a budding on-screen rivalry between the two, but it was not to be.