Unless doing an under the nail scrub, she is picking up bacteria from under her nails. To say that your child will get sick, can't, to say she won't, can't. I still couldn't take that chance as my daughter had rotovirus and and got really sick, ended up with meningitis as a opportunistic infection. We are currently dealing with memory loss, hearing loss, learning disabilities. All because of oral/fecal contamination. She should put a small amount of water in with her formula in a shaker(it has the blades that do what she thinks she needs her hands for) and shake, then add the formula and appropriate amount of water to complete the pitcher. Like I said she may never get sick with this method, she may get deathly ill. Spin the roulette wheel and decide what you want to do.