Important Note!: I have NOT paired her at all, and I have had her since being a baby. I would not breed at this size for females.
This seems pretty obvious to me, but I’ve not raised a female from a baby, so I wanted others to pitch in. Is this a big fat ovu belly? It’s all squishy.
She weighs 690g today and reliably takes an XL Mouse weekly. Never skips a meal!
How old is she?
The tail suck and swell does look a bit like one. But it’s also very close to the tail. Ivy is usually a bit higher up. But I have seen a couple gassy snakes bloat up like an ovy too.
She is 2 yr 2 months
An ovulation on a snake this size would look like she ate a huge, huuge meal.
Your girl looks like a clean up is in your future.
An Ovulation belly would not be squishy, they are very firm to the touch and only last around 24 hours. I’m thinking she may just be retaining some 
to let go soon.
The belly “swell” I’m seeing here is also too far low on the tail, an ovu belly would be about 2-3 inches higher from the tail and depending on the fat content on the snake the tail suck would appear as a strong indentation in the belly and the tail may struggle to straighten.
Either way just keep an eye on her and see how she does 
