First shed is (or at least the first shed for snake after I get it, because I assume they will have shed before I buy them) - is a milestone :-).
Good advice on the humidity if the shed wasn't complete. As for spotting the shed coming, with our albino we have to rely more on here skin going dull because with the lack of pigment her eyes don't go blue (I think they turn a paler reddy-pink, but it's not easy to spot like it is with normals where the eyes are clearly blue-grey).
If she's growing at the rate our baby checkereds did you can expect another shed in anything from 2-4 weeks.