It does look like she's got bumblefoot. Photos often show things you don't notice with the naked eye. Looks like a scab starting just off-center of her foot pad, and some swelling and redness in the center. Also near the base of one toe is some swelling and redness, maybe a small scab there, too. I also notice her toenails are quite long - so she's been favoring that foot for some time. You may need to trim or file those back as well as treat her foot and bandage it.
If you can, soak her foot and clean it as well as you can for a closer look. It's hard to see whether that's certainly a scab, or just dirt.