Winter snow boots for kids are super cheap if your store has any. I picked up a pair today when I was working out in the Greece store for $1. I saw a bunch size 10-13, but was looking only at the smallest ones. The 10s may be too big this winter, but I figure she can even use them as mud boots next summer for that price.
The Gates Walmart (and I think all of them now bc it is a new mod) has a $0.88 area. It is random healthcare stuff. But one of them is pregnancy tests. They work, I bought some for the fun of it. The only down side is you can't pee on them, you have to pee in a cup to make it work.