Honestly just dont over complicate it

3x3 stone or metal foundations

X4 dino gates

Place foundations, and 3 gates. 1 on each side

Gain aggro and kite reaper into trap, place the final gate off the back of your rock drake

Be sure to bring some medbrews, shields to waste, and maybe a charge light for convience (not essential but helpful)

Itll be below 2k health, turn off lights

Approach her, try to gain aggro and tank her attacks until she screams

That means shes going to sniff you, when she does stay about 1 foundation away from her nose and jump (may not have too, do this to conpensate for uneven ground)

Once impregnated simply get your medbrews down and get on your rock drake, kill the queen for pheromone glands and XP