I really feel for everyone in the situation. You are very kind to worry about Mya feeling like a pariah - this must be a terrible year for them all. But of course you want to protect your family. I think that MRSA, along with H1N1 and strep and pneumonia, are "out there" and you are exposed regularly. Unless you are going to keep your kids out of school, stores, malls, restaurants, and so on, you are all going to be exposed to something. You can't go around disinfecting everything, and a lot of authorities say we are actually creating problems by over-sanitizing. I'm not saying you were wrong to do that when you knew MRSA was in your house, mind you. But our use of antibacterials is killing beneficial bacteria and allowing other things (super-bugs, resistant germs, and all viruses) to grow out of proportion.
Experts say we are all at greater risk than 20 years ago, since our foods are deficient and our soils are depleted - we are missing key nutrients and trace elements. In 2003, the AMA said everyone has to supplement no matter how "healthy" we think our diets are - but the Physicians Desk Reference as well as a major investigation of the nation's water supply say that pills (vitamins, etc.) are not absorbed well at all, and often 70% of what we take winds up not being used by our bodies and winds up being eliminated into the sewage systems. So, a lot of money and a lot of intake goes to waste. In fact, my stepdaughter's pediatrician told her not to bother giving her kids Flintstones vitamins or anything similar - they just created "expensive urine" because most everything is excreted. The only way to go is liquid nutrition. Our family did that 2 years ago and no one has had a cold since. My son has been exposed to numerous severe infections and has gotten not one thing. So, to answer your request about ways to protect your kids, that is the way I would go.