She seems kind of small/young from the picture. What is her weight and age?
Also, you can try palpating her gently and if you feel hard bumps (like grapes or marbles) a little more that half way down her body then you are feeling follicles and she is laying inverted due to building. If you feel distinct lumps that feel like marshmallows (soft ovals) then you are feeling developing eggs.
I have seen girls that weren't bred do this and also males laying this way after a meal so just laying in this position isn't a tell tail sign she is gravid. If it is in conjunction with other signs like not eating, bowl wrapping, laying coiled, or an ovulation then it could be due to her building or being gravid.
Good luck and it would be sweet if she was!
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