I have one that she will like and is well made, and is upholstered with natural latex and contains no memory foam.
My granddaughter has this mattress and it is comfortable...good support and a nice in between feel...not too firm or too soft.
The coil unit is pocketed coils, so they will contour to her easily.
The trade off is the delivery...FedEx instead of white glove.
The mattress is the Wolf Latex Hybrid Adara model.
Delivery is free and there's no sales tax.
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Free Delivery Nationwide....US & Canada...NO SALES TAX.