blonde is a recessive gene and red hair is the same gene as for black hair, just expressed weakly.
besides, the hair colour she has now is 99% probably nothing like the colour she'll have when she grows up. i was born with a full head of long, thick coal-black hair, complete with blue highlights. by the time i was 3, it was platinum blonde and my natural colour now is dark blonde (medium brown with a crapload of blonde highlights).
my oldest daughter and my youngest, born same way - thick, long black hair. my oldest (now 23) went through copper red hair to platinum and now has massive amounts of wavy chestnut brown hair (dark brown with a lot of red highlights). my youngest (2-1/2yrs old) has hair that's coppery brown with brass-coloured streaks.
my middle daughter (now 20) was born with a faint fuzzy light brown mohawk, was champagne blonde as a toddler and preschooler, and as an adult, until she lopped it all off, she had a butt-length cascade of dark blonde spiral curls.