Based on what I can see, this doesn’t appear to be bumblefoot. From the photo, it looks more like an injury - possibly involving the toenail, though the angle makes it a bit difficult to assess fully.
If you’re able to catch her, a close-up photo of the tip of the toe would help clarify. Assuming this is a nail or toe injury, I recommend basic wound care: gently clean the area with a chlorhexidine or povidone-iodine solution. With supportive care, birds typically heal well from these types of minor injuries.
Let me know if you can provide a closer image or if you notice any swelling, discharge, or worsening that might need more attention.