1) get her inflicted with tenacity up (BB8's basic)
2) get her dazed (BB8 basic aswell) and stunned (R2 / Finn)
3) use basics only (including BB8) when she's stunned and built up some protection ups
4) use high dmg specials from JTR, RT or Finn when she's out of stun
4.1) use R2's smoke screen to avoid attacking Nest in that time window
4.2) use BB8's illuminated destiny in that time window if available otherwise use covert data to avoid attacking Nest
4.3) use JTR's mind trick if your next character to go is either RT or Finn since they're hitting harder
Vs extremely slow g12/13 Nests this can be quite a long battle but usually it's an easy win.