This is around the time of year that females leos are roaming around looking for mates because they have nice, big follicles developed, ready to ovulate and be fertilized (or laid as slugs like yours did, as LarryF pointed out).
When you know what you're looking for, a glimpse at your gecko's belly can show you the developing follicles. Here's a photo I snapped of my female in May:

See those large whitish masses? Those are developing eggs (whether they are follicles or have ovulated I can't tell, personally. It's possible, but I'm not that good
). If the gecko is not mated, sometimes these will have shells deposited and the gecko will lay slugs, sometimes they will be resorbed by the body.
Because the follicles/ova/eggs take up a lot of space in the gecko's coelom ("abdomen"
, she won't be very hungry, usually. It is not uncommon for leos to eat very little or not eat at all over a few months. This should not be a problem if the gecko was healthy in the first place and if you have good husbandry (keep her temps in the proper ranges, lots of hiding places and room to exercise, calcium dish available, offer some food anyways, and keep her clean).
Your girl does look quite healthy in the more recent photo, nice plump tail and good body condition. As long as she stays alert and active, you needn't worry.
Dystocia is the term for difficulty or complications while giving birth, but for egg-laying animals like many reptiles it's a bit of an umbrella term for all complications related to follicles/ova/eggs and laying. Dystocic lizards quickly become lethargic and depressed. If your gecko had some kind of problem with her developing eggs then you would notice a drastic change in her behaviour, she would not be roaming around actively.
Keep us posted!
Christina
www.herptiles.net