M.L.
I'm a hairstylist. New gray hair very often grows in very wiry, coarse and kinky. There is little she can do to change this this aside from plucking it out. However, if she would let it grow, she can color it and even do deep conditioning treatments on her hair, such as Sebastien's potion 9. While the hairs are still short, she can use a light pomade or wax to sort of lay them down.
Since her hair is thin and blonde, than doing some highlights or a color on the gray hair would help her feel better, and help her hair feel more manageable, youthful and add volume.. Once the grays grow out, she can blow dry them straighter. But continually plucking isn't going to help in the long run.