Okay, there is a sticky that is at the top of our forum about how to test for mastitis. Her milk may be off because the mastitis isn't completely gone, it has just gone sub-clinical. It is important to test for it as their are different KINDS of mastitis, caused by different things, and you treat them with completely different things.
Was her mastitis caused by staphylococcis bacteria, or a strain of e. coli? If you don't know the answer to that, then you need to test her milk, as she likely still has the mastitis in sub-clinical form.
Now, how to prevent mastitis:
Grain is not a complete feed for goats, or even anywhere close. Goats in the wild have a very wide variety of food available to them, with different vitamin and mineral make up. Just like we can choose to have a wide variety of dishes every day, ranging from brocolli to daikon radish to deep fried mushrooms...each of these food address our vitamin and mineral needs.
Goats have some grain that we give them, grass hay...and often grass pastures, and some alfalfa. Goats are actually not grazers, they are browsers, and a mostly grass diet with some grain added to it does not do it for them.
Since it is difficult to bring them a wide variety of salads to meet their needs ("Would Madame Doe prefer the Oak Leaf, Western Ragweed, and Illinois Bundleflower salad today? Or perhaps the Sugarberry Twigs, Maple Leaf, and Purple Prairie Flower will pique her appetite? We have a special today, specifically invented by our nationally recognized Goat Chef, called the "Tree Delight" consisting of Cedar and Pine needles, the tender bark of a special selection of fruit trees, Wisteria flowers and leaves, and garnished with Marigold and Rose blossoms.") , we resort to supplements. These are sorta like Multi-Vitamin/Mineral doses, just for goats.
The "minerals" that work for goats are loose minerals, NOT blocks. Never get blocks for goats. However, I could spend all day going through all of the brands of loose minerals, which ones work, which ones do not, and why...just to find that YOUR local feed store doesn't carry anything considered decent.
So, I am going to make it easy for you: Get some Replamin Plus Gel in a tube and give your doe 5cc of it for three days in a row (to bring up her vitamin and mineral levels) and then give her 5 cc of it once a week after that.
Then, come back here and get a goaty education.
There are LOTS of things you need to know which, I am afraid, you may have gotten into goats without knowing. Such as:
1. CAE and CL are both contagious, incurable diseases found in goats that can cause mastitis. Has your goat been tested for these disease? If not, you need to get her tested...these are major diseases that can pass to innocent kid goats, and that shorten the lifespan of goats, and have *terrible*, miserable endings. I cannot stress enough how important it is to make sure your goat is clear of these diseases.
2. What kind of udder wash do you use on her before you milk her? Do you dry her udder after washing, and before milking her? After you finish milking her, what kind of teat dip do you use? Washing the teats and udder in a good, antibacterial wash is very important, as it keeps such buggies out of your milk. Drying the udder after washing is also very important, as it keeps droplets of your wash from getting into the milk and making the flavor off. The teat dip is important because after milking, those orifices are TIRED...they have opened and closed a lot, and it takes them about a half an hour to want to close all the way again. That is a half an hour that, if she goes to take a nap or stroll through hay, all sorts of little buggies can get in there and infect her udder.
I hope this information helps some.
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Well, that is a lot less threatening than some folks that have said they wanted to steal my brain. 
It's the only one I have!
