I have used her a few times and like most have said she is just one choice in the expensive heavy hitters that Neverborn can field. My main opponent refers to her as she activates and something which has been true recently because ML 7 with 4/5/6 is very strong. I have not taken any upgrades on her recently because I have felt it not needed.
Personally when I am looking at 10+ss Beaters in Neverborn I look at Nekima, Teddy, Mature, Rider. I take them all in different games depending on what I need. I think that out of these 4 Nekima is best in the early game because of the inbuilt 3 AP and wk6 with flight, it allows for turn 2 engagements with killing power and she can easliy run on the flank by herself. If I am looking for a model that will be around all game I don't take Nakima as I fully expect her to die turn 3ish after disrupting the enimy and most likely getting at least one kill. If I think I will need a heavy hitter all game I will take the Rider and hide him turn 1 then bring him into action end of 2, or I will take teddy with the healing and Terrifying all. He is also slower to get into the fight so is more of a cleanup model after a vanguard disrupts early actions.
Last game with Nekima was Reckoning where I took Nekima, Rider, Mature, BBS, and Collodi vs the Viks where Nekima was a flanker that handled Tealor and a convict gunslinger allowing for the rest of my force to deal with the Viks in the middle of the table.
So like everyone else has really said she can be good but only really when it is called for and I have not put an upgrade on her since mid way through the beta but that is a personal choice.