It doesn't look like a bite to me. I suggest checking your enclosure for exposed tape or sharp edge. Perhaps even use paper towel substrate and just a hide/water dish to keep the set up simple while your girl heals.
And I highly encouraged you to consider housing your snakes individually. Ball pythons are solitary animals and should only be placed together for breeding purposes. While long term cohabitation is doable, it is not recommended for new and/or inexperienced keepers.
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