>>76891733She wasn't "prefectly fine with never speaking to Mint again", she reached out to her immediately when she saw a chance.
Even if Pomu didn't take part in the harassment, she was still pretty close to Elira and Millie, so I can easily imagine Doki feeling terrified about being rejected or even blamed for what happened to NijiEN after her termination. Don't forget that she tried to kill herself two times not even half a year ago, those kind of scars never disappear.