This second shed is probably your post-ovulation shed, and you'll have slightly less than a month til eggs. If her lower half looks big, she's laying in a perfect coil on the warm side of the enclosure, starting to get rather grumpy when you open the cage...you've got a gravid snake. You'll know she's about to lay when it looks like her backbone is stickin out when she's laying in her coil. When I saw that (and didn't think my girl was gravid) I just about flipped because I was wondering how on EARTH my female had gotten so skinny lookin so quick.
Good luck, and get the incubator ready 
~jenny
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1.2 normal ball pythons (Cindy, Darwin, and Periscope)
0.2 rescue chinese water dragons (Yoni and Linga)
1.0 rex rat (Scurvy)
1.0 gerbil (Yerbul)
0.1 bunny (Spazz)
1.1 betta fishes (Vicious and Killer)
2.2 great danes (Shasta, Odysseus, Merlot, and Watson)
1.0 fat fuzzy mutt (Smokey)
1.1 cats (Thidwick and Turtle)
3.0 horses (Buddy, Sam, and Scout)
1.0 goat (Billy Jack)
1.25 chickens (Ugly the rooster and his harem)
