that sounds really awful for you

I can't imagine the pus would harm her, it's just white blood cells after all. How does her tummy seem after a feed? Is she unsettled at all?

What is causing the mastitis do you think? Do you have hard lumps and blockages? I have seen a physio for ultrasound when I get bad blockages that won't shift. It's really effective and can deep into the breast tissue.

Hope you get better soon