Lump on leopard gecko's stomach

Hello fauna, recently my leopard gecko has been having some problems. It was just noticed about 3 days ago when I got back from vacation. During vacation my grandparents were feeding her 5 mealworms a day. I made them a detailed list of what the had to do for each of my reptiles so there shouldn't of been any problems. She has eaten mealworms primarily for the past few months. Yes, she is an adult. I've had her for a little more than a year now. She has been completely healthy besides one problem where she had blood in her stool. She was taken to the vet, given an exam and had her feces exams. The vet said that she just had a little constipation and told us to feed smaller amounts everyday rather than larger amounts every other day. So, back on topic.. When I got home i noticed that there was a lump on her stomach. It is in the center and is fairly large (pictures at bottom). I gave her a warm bath yesterday and it felt rather soft and squishy. She has had a bowel movement since ive noticed it and the lump is still there. The only thing i could think of that could of caused this is when the power went out a few hours one of the days we were gone. So thats what i know, and i need help from you guys to figure out whats up. Here are the pictures:

Here is the information:
Age: 1 year
Weight:75 grams since last time weighed
Lighting and heating: 40watt day bulb and a red bulb on a dimmer to act as a night time viewing bulb. Also a UTH set on a dimmer
Temp: 86-88 degrees on the floor of the hotspot
Tank: 20 gallon long
Misc: fresh water daily, calcium without d3 in dish, 3 hides and a humid hide, feeders dusted with repashy leopard gecko supplement

Here is another picture with a better view

Without a better picture, it almost looks like a hernia. Can you put her on a piece of transparent glass or plastic and take a photo of her from beneath?