Penny has a foot abscess

Well unfortunately poor Penny is in at the moment as she has a foot abscess. I noticed her looking like she was favouring a leg and the next day she had a filled fetlock, with a strong pulse. I suspected a 'poisoned foot' as this is very common with brood mares, this being because they are out in the mud all the time and it's a perfect breeding environment for bugs! So she is resting up at the mo with a foot poultice on. Hoping she will be better within the next couple of days.