Free to good home, one 15 yr old daughter

I just amazes me, and it shouldn't, just how much Sandy thinks she can get away with. The past two days we have been battling with her to brush her teeth. Last night she went to bed around 8:30 pm and went straight to bed without brushing her teeth. I went into our bathroom at the same time she did went into hers and when I came out a minute later she was already in bed. I asked her if she had brushed her teeth and she said yes. I replied with "What, in two seconds?" And she came back with yes, in one second. I told her that one second brushing is definitely not brushing one's teeth and she needed to redo this task. She came stomping out and ten seconds later closed her bedroom door. So this evening she went to bed and I suspected that yet again she had not brushed her teeth, so I went into her bathroom and looked high and low and could not find her toothbrush. I have no idea what she did with it or how long she has been without a toothbrush. We will have to soak one of our old toothbrushes in peroxide so she has a toothbrush seeing as we don't have the funds to get her a new one. And even if we did have the funds to get her a new toothbrush I wouldn't buy her one because she is still sick. I would normally wait a few more days and was sure she had thrown the cold off before I would buy her a new toothbrush. SO not only do we have to check to be sure she takes her pills morning and night I will have to stand there and make sure she washes her hands and brushes her teeth. Just what I want to do with my morning and evening, police a 15 yr old who is acting like a two year old.