I do not agree! These creams have some scary stuff in them, even the really sensitive skin types can be very harsh on sensitive skin.
Razors are not chemically based and so in that sense very different.
PLEASE don't use these on such a young lady.
My Daughter has the same problem. Her hair is very dark. To begin with I would help her shave under her arms, teaching/ explaining as I went. An electric razor would be great, with safety talk about not near water of course.
She has the option of waxing, it will hurt for a little bit, but not too long, and the hair doesn't grow back as quick, I have explained. The choice is hers. She doesn't feel ready.
She is nearly 12 now and shaves with confidence. Sometimes she let's it grow, sometimes she doesn't. The choice is hers. We use venus wall mountable style refillables.
Lemon juice is a great "bleacher", apply direct to hair and expose to sunlight. (a bedroom window will do.)