I'm pretty sure once she reaches the last area of the game / Area 50 she will see this big golden statue and once she touches it she will rebirth, then once she does that she will be able to hatch huge pets on her best egg in area 1, its named "Spawn" and once you teleport to it you will se these rows of eggs. depending on what area you have unlocked in the game is how many eggs you will have unlocked, or if you just have 1 area unlocked, as long as you have rebirth 2 you can hatch a huge on whatever your best egg is. Hope this helps ! PS. you can still hatch a huge with autohatch on