I only just saw this (internet mucking up). Okay, frequent milking both by yourself and the calf will help greatly. Make up an udder rub consisting of the following..
fresh aloe vera (doesn't matter the quantity.. think a lot)
cayenne pepper or curry powder whatever is in the pantry
some olive oil, or whatever oil you have available to you
tumeric (if you have it, a natural anti-inflammatory)
now whiz it all up in the blender until its a nice sticky mess and take it out and put it into a jar with a lid. To the jar add a few good drops of Ti tree oil (do not put this in the blender or you will never ever get the smell and taste out of the plastic). Give it a really good shake.
After every milking give slather this rub over her udder (or the affected quarters). Give it a massage for as long as you have time to do it and leave it on. If your saving the milk, you'll need to wash it off before you milk, otherwise you'll get the milk tainted.
Keep doing this, and tasting the milk too. Mastic milk is salty to taste, as well as lumpy and somewhat slimy (it leaves a slimy residue on cheesecloth as it filters through).
If it doesn't resolve within a few days, or you are concerned that its getting worse, then you may have to go the antibiotic route. You can use a teat infusion on a lactating cow, and the infusion will stain the milk blue for the entire time that it should be withheld from HUMAN consumption. Obviously if you are going for pure organic meat in the calf, then the calf shouldn't have access to the milk, otherwise, it is perfectly safe for the calf to drink the blue tinged milk (check with the vet but I'm 99% certain that is the case). The good things in the milk far outweigh the antibiotics in the milk from the calf's perspective. If concerned you can slurp some natural yogurt or probiotics down the calfs throat (which is much easier if you are bottle feeding) otherwise, get your hands gooey with yogurt and get the calf to suck it off your hands!
Now if the mastitis is gone, then the milk is good to drink whenever the collostrum has gone. The bright yellow colour should give way to normal milk colour (for your breed). I had pink milk for the first ten days, so was giving that to the chooks and dogs.