Reaper queens are weak the only thing they have going for them is hp and torpor damage. But they are easily killed with tamed spinos they don't resist damage they just have crazy hp regen when not under charge. So bring a charge pet which you should already have if you're venturing into the purple.
After getting pregnant, you can feed the baby without using reaper pheromone glands. I built a 3×3 metal box 3 walls high and placed a trap door in the top centerr with ladders going down. I drop in, access inventory, feed and climb right out. I use a chargelight dino and take little damage in the process. ALSO BABY PHASE IS ABOUT 8 HOURS so dont sweat it too much if youre an experienced breeder.