No, she doesn't walk directly on the scab. She may put some weight on the back most part, and when she walks forward she probably puts some pressure on the scab. But the entire scab isn't hitting the ground when she walks and isn't under her foot. I hope that's a clear explanation.You may need to limit her activity for part of the day and see if that helps with the healing process.
Not sure where she places that stub when walking - would you say it's directly on the scab or ?