I wouldn't recommend grabbing onto her. When I brought one of my axies home from the pet store and she had ingested gravel I put her in the fridge to clear the impaction. In her fridge tub she would let me gently feel her underside where I could feel the stones, probably because she was in the colder water and feeling slow and sluggish. If your lotl is swimming away and not letting you then don't force her.
She could have produced eggs and be retaining them, which is another reason she might look swollen. If you can get a good picture of her back leg area we could probably determine for sure if your axie is a 'he' or a 'she'. From the video your leucistic looks like a boy.